In this article, we will cover the basics of fertility monitors and how to use them to track your ovulation. We’ll also discuss what a fertile window is, as well as some tips for predicting when it might happen. 

The first step in using a monitor is making sure you have an accurate reading of your cycles – which means tracking both your menstrual cycle and any symptoms that may be related to ovulation.

If you’re not sure about what time frame to base the measurement on, consult with your doctor or gynecologist before proceeding!

There are many different types of fertility monitors available on the market today – from simple urine tests that test for LH hormones (which indicate that ovulation has already happened) to more advanced devices that measure blood flow in both the vagina and cervix.

It’s a good idea to familiarize yourself with the monitor before using it – instructions that typically come in a booklet should be followed carefully, especially when you start using a new monitor for the first time!

In this article, we will cover two different types of fertility monitors: Urine test strips, which are very inexpensive but have been known to produce false readings Oral hormone tests, which can help to identify up to 6 days in advance when ovulation is going to happen.

The saliva test is considered more accurate than urine tests because it checks for luteinizing hormones (LH) in your system.

The key here is to recognize that each type of monitor has its own strengths and weaknesses – which is why we’ve included some information on both here!

Ovulation Predictor Kits (OPKs) and Fertility Monitors: How They’re Similar and Different

Fertility Monitors

Ovulation Predictor Kits – Why You Might Want To Try One Out

There are a number of reasons to consider using an OPK. One of the biggest benefits is that it helps you pinpoint your most fertile time frame each month. In many cases, this can be up to 6 days before ovulation actually occurs!

It also makes it easier to find out if there’s going to be a problem with fertility later on – if timing is an issue, you won’t need a full calendar of tests – just check the results each day.

As we mentioned earlier, OPKs use a method known as ovulation detection to figure out when it’s time to try and conceive.

When you purchase an OPK kit , it will typically come with 10 sticks that measure the amount of LH in your urine sample.

Since this hormone peaks 24-48 hours before ovulation actually occurs – if you take a look at the kit, you’ll see that it has two windows: one for today and one for tomorrow’s test.

The kit will also give you some guidelines on what colour your test line needs to be in order to indicate ovulation is going to happen soon. If no second line appears, then wait until the next day and repeat the process!

Ovulation predictor kits: What You Need To Keep In Mind

One of the biggest downsides of OPKs is that they can produce false readings (especially if you’re testing too early).

Since there’s no way to determine how much LH you have in your system, this can make it harder to get an accurate reading.

fertility monior

Another thing to keep in mind with OPKs is that they only work for women who are near ovulation – which means that timing will be essential. If you know exactly when ovulation occurs, then having one of these kits on hand won’t be a problem!

However, if you don’t know for sure when you’ll ovulate or think it’s going to happen soon, then we recommend trying an oral hormone test instead.

These are more accurate because they can detect the surge in hormones that typically occurs just before ovulation.

Using Your Fertility Monitor: How To Keep Track Of The Results

When you’re using a fertility monitor, it’s important to keep track of all your results . This will help ensure that you get the most accurate results possible – which means knowing when ovulation is going to happen or not!

Here are some tips to help get you started

Make sure your monitor comes with instructions so you know whether or not urine testing strips need to be used first (if so, read the instructions carefully) Ensure there’s enough fluid in the monitor so it doesn’t dry out during testing Make sure any test strips that need to be dipped in liquid are aimed correctly when you apply the fluid.

You don’t want them to overflow or under-fill – which can affect results Take all of your test and record your results in a journal, spreadsheet, planner or calendar. This way you’ll always know what’s going on and when it’s happening!

What To Do If An Entry Is Lost Or Your Monitor Has Stopped Working

While we love the fact that fertility monitors help increase awareness about our bodies and make it easier to figure out when ovulation is going to happen, sometimes life happens.

Therefore, if something goes wrong with your monitor (or there is an issue with one of your entries), it makes sense for this not cause any problems later on.

Here are some tips to help make sure this doesn’t happen:

If you’ve lost an entry, don’t worry too much about it – just enter the date and your results in the right spot If something goes wrong with your monitor, keep all test strips, used or not. This will ensure that you can return them to the manufacturer for testing .

Most companies offer a warranty of up to six months so they’ll definitely be able to assist if required

Although fertility monitors are more expensive than regular ovulation tests, there are several reasons why they’re worth considering! Here are just a few benefits worth mentioning:

They allow you to see when ovulation is going to occur because LH levels rise 24-48 hours before it actually happens They’re typically more accurate than regular ovulation tests and can detect hormonal changes that occur just before ovulation (which is great for predicting fertility) If you know exactly when your LH surge occurs, then you can use a kit to help maximize your chances of conceiving.

While these monitors aren’t perfect and won’t work if you don’t know when your LH surge happens, they definitely make life easier.

And with the right tools and information, it’s possible to get results quickly and effectively!

If you want to learn more about this topic including some helpful tips about using an OPK , please be sure to check out our review page .  You’ll find all kinds of useful information there along with links to other related resources.

We hope this article helped shed some light on the whole ‘fertility monitor’ debate and has also helped give you an idea of whether or not these tools could be useful for your family planning goals.  

Questions and Answers about Fertility Monitors & Ovulation Calculators

How long should I track ovulation before trying to get pregnant?

That’s something that can vary from person to person.  So instead of trying to track ovulation for an extended period of time, it might be easier (and more beneficial) if you invested in a fertility monitor.

If you’re not sure whether or not this type of tool is right for you, please feel free to check out our reviews page .  You’ll find reviews of all the popular devices on there along with links to other related resources like calculators and tips.

Is your peak fertility your ovulation day?

Not necessarily.  When you’re trying to conceive, it’s important to pay attention to your overall fertility pattern and not just one specific day (unless you know for certain that you ovulate on a particular day).

I’ve heard ‘ovulation predictor kits’ and ‘fertility monitors’ used interchangeably. Can they be used the same way?

Yes!  Oftentimes people will refer to both of these terms as ovulation calculators or OPKs .  And while some may use them in slightly different ways, the simple truth is that these are all tools designed for predicting fertility.

What is an OPK ?

An OPK is short for Ovulation Predictor Kit – which typically refers to a fertility monitor.  And because these tools are designed for predicting fertility, they work by measuring the LH surge that occurs before ovulation.

Is there a cheap and easy way to determine when you will ovulate?

As far as cheap goes, it may not be possible (unless you’re willing to spend more than $30 and don’t actually need a tool).  But if we’re talking about ‘easy’, there is one method of predicting fertility known as the calendar method .  This strategy takes advantage of the fact that women typically release an egg every month.  

Calendar Method: How To Predict Ovulation And Achieve Pregnancy Naturally With A Calendar Method Fertility Chart

How long should I wait after my period before I take a pregnancy test?

This will really depend on the type of test you use and how soon after your period you test.  Typically speaking, if you’re testing with a high quality digital test (like the kind we mentioned in our post about taking accurate ovulation tests ) then you should wait at least 2 weeks after your period to take that first test.  

But if you decide to buy an OPK , then waiting 1-2 days before testing is recommended because they’re typically more sensitive than regular ovulation tests when it comes to detecting LH levels.

How do I calculate my ovulation chart?

There are several ways to approach this, but we typically recommend using an ovulation calculator .  These tools will help you determine:

How do I know when I am fertile and ovulating?

Assuming you are tracking basal body temperature changes, it’s safe to say that you are probably ovulating.  The truth is, many women don’t realize they are fertile during their cycle because they don’t have a clear understanding of what should be happening during the process.

So if you’re looking for some more information on fertility charts , we can help!  Please feel free to check out our post about how to chart your fertility pattern .  

How can you tell your ovulating and not get pregnant?

There are various ways that women use to avoid pregnancy, but this generally boils down to using some form of contraception.  The most common type of contraceptives include:

What is the difference between fertility and ovulation?

Fertility and ovulation are actually quite different processes.  This is mainly because they each work at their own pace and use different hormones (including LH) in order to complete their job.

So you can think of it like this: fertility refers to your overall ability to conceive, while ovulation refers to a specific process that occurs just before fertilization can actually take place.  

What does luteal phase mean?

The luteal phase is another term for the second half of your menstrual cycle (after ovulation).  It is during this time that the egg (which was released after ovulation) moves towards the uterus and attaches to the lining in order to begin its journey.

After fertilization, it’s also common for women to experience implantation bleeding.  This spotting occurs as a result of the egg attaching to the uterine lining, not because there has been any change to your menstrual cycle.  

Can you get pregnant when you’re not ovulating?

While it is possible to get pregnant without ovulating, this doesn’t typically happen because there will be no egg present.  So instead of conceiving right away, your body will need to wait for the next month before ovulation can occur and produce another egg.

If you’re trying to avoid pregnancy and think that you’ve had sex during a time when you didn’t ovulate, then we recommend checking our post about looking for implantation bleeding .  

How soon after peak do I ovulate?

In most cases, ovulation occurs right around the time of a LH surge.  But because the duration of each surge is different for every woman, it’s impossible to say exactly when ovulation will occur.

What does OPK stand for?

OPK stands for “ovulation predictor kit,” which is a type of test that can be used in order to detect luteinizing hormone (LH) levels.  These tests are typically used by women who wish to become pregnant and want to know when they’re going to release an egg so that they can have physical relation at the most opportune time.  

How soon after I start using Softcups do I need to Ovulation Predictor Kits or OPK’s ?

If you want to get the most accurate results, we recommend using both types of tests.  This is because Softcups are not typically sensitive enough on their own to detect LH levels and can sometimes give off false negatives.

How many times do I need to test per month?

It’s up to you how often you would like to test.  Keep in mind that it takes more than one LH surge each cycle for women to become pregnant.  So if you’re looking for a high level of accuracy, then testing twice per day (every 12 hours) is recommended.   

What time of day should I take OPK’s?

The majority of ovulation predictor kits work best when testing first thing in the morning.  This means that you should take a test when you wake up and then wait to see if it becomes positive before testing again 12 hours later.  

Do OPK’s work for women who have PCOS?

It’s possible for ovulation predictor kits (OPKs) to work on women who have polycystic ovarian syndrome (PCOS), but this isn’t guaranteed because LH is not always present during their cycle.   

What does “retest” mean on an OPK kit box?

The term “retest” refers to taking another test at twelve hours after your initial test in order to identify any secondary surges of LH.  If the second test turns out positive, then this means that you’re most likely going to release another egg within the next 24 hours.

When is the best time to implant during ovulation?

For best results, you should have physical relation during ovulation at least 2-3 times in order to give the sperm an ample amount of time to fertilize the egg.  Keep in mind that it can take up to 6 days for conception to occur, so don’t worry if physical relation doesn’t lead straight up to implantation.  

How long after peak LH do I ovulate?

In most cases, ovulation does not occur immediately after LH surges.  It can take up to a day or two for the egg to fully mature and become ready for fertilization.

How many days do I ovulate?

There isn’t a set number of days that you will ovulate because this can change for each woman.  In general though, ovulation typically occurs around the middle of the menstrual cycle and lasts for about 24 hours.  

How many days after an LH surge do I have to have implantation bleeding?

Implantation usually comes anywhere from 5-15 days after conception takes place.  But if pregnancy hasn’t occurred, then there won’t be any signs of implantation (other than possibly spotting).

Can you get pregnant after peak ovulation?

It’s possible for women to become pregnant up to 5 days after ovulation, even if they had physical relation on the day of ovulation.  This is because sperm can live inside the woman’s body for as long as five days and fertilization doesn’t take place until it enters the egg.   

How long do I need to wait before taking another OPK?

There’s no set amount of time that needs to pass between testing with ovulation predictor kits (OPKs).  If your second test comes out positive, then you’ll know that fertility is high and there’s a better chance of conceiving.  But keep in mind that it could take as long as 12 hours for LH to surge again depending on the woman’s cycle length.

Can OPKs show false positives?

In most cases, ovulation predictor kits (OPKs) should not give false positives because they detect a high level of LH which isn’t present during other times of the month.     How much does an OPK cost? On average, ovulation predictor kits typically cost anywhere from $5-$15 each.   

Do OPK’s work for women who have endometriosis?

In some cases ovulation predictor kits (OPKs) can work on women who have endometriosis, but this will depend on the severity of their condition.

Sometimes it’s also possible for these kits to give false negatives because of how LH works with estrogen throughout the menstrual cycle.  

Can I get pregnant 2 days after positive ovulation test?

Yes, it is possible to become pregnant 2 days after an ovulation kit turns positive because sperm can stay alive anywhere from 3-5 days inside the woman’s body.    

What does “positive OPK” mean? When you see a plus sign on your ovulation predictor kit (OPK), then this means that LH levels are high and there’s an increased chance of pregnancy occurring soon.   

What factors affect how well OPKs work?

Ovulation predictor kits (OPKs) usually work best when there aren’t any fertility issues.  But keep in mind that if you have polycystic ovarian syndrome, then it’s possible for these test to give false negatives even one day before your LH surge.   

Can implantation bleeding happen too early?

Implantation can occur anywhere from 5-16 days after conception, which is why it’s possible for spotting to take place too soon before a pregnancy occurs.  

Does an OPK expire?

Most ovulation predictor kits (OPKs) will not expire and remain good for approximately one year after they’ve been produced.  And this means that you can store them inside of a cool dry location without worrying about them going bad anytime soon.    

When do most women get their positive OPK?

In most cases, the peak day for fertility will take place anywhere from 12-48 hours after ovulation has already occurred.  So if you had physical relation on the same day as your positive OPK result, then there’s a high chance of pregnancy taking place soon.   

What time of day is best to take ovulation test?

Ovulation predictor kits (OPKs) can be taken at any time of the day because they detect LH levels in your urine.  But keep in mind that it’s possible to get false positives if you take them too early before your LH surge occurs.   

What should I do after getting OPK positive?

If your ovulation predictor kit (OPK) turns positive, then this means that you’ll have the best chance of conceiving over the next 24 hours.  So make sure to schedule a date for conception as soon as possible.    

When do OPKs show low fertility?

An opk will usually show low fertility anywhere from 24-48 hours before menstruation starts, but this can vary depending on the person’s cycle length.  In addition, these test can also give false positives for women who have PCOS or other types of fertility issues.   

What does a positive ovulation predictor kit mean?

A positive sign on an ovulation predictor kit (OPK) means that the woman is probably going to ovulate within 12-48 hours.   

Why do OPKs sometimes not work?

There are many reasons why opks may not work, but one of the main factors involves LH surge which isn’t present due to a hormonal imbalance during menstruation.  In addition, it’s possible for opk tests to show negative results because they detect estrogen instead of LH.

Does implantation bleeding always happen?

Implantation bleeding can occur in women who have endometriosis, but it’s not guaranteed to take place.   

How soon do OPKs detect pregnancy?

Ovulation predictor kits (OPKs) cannot detect a pregnancy until implantation occurs, which is anywhere from 6-12 days after conception.    

Does an ovulation kit work if you have PCOS?

fertility monitors - ovution kit

  An opk test will usually fail to work for women who have polycystic ovarian syndrome because their LH surge is abnormal by nature.  But keep in mind that these tests can also give false negatives for this reason too.    

When should I get my blood tested for ov?

You should get your blood tested for ovulation anywhere from 12-16 days after your last period.  But keep in mind that ov tests can also give false negatives if you have PCOS or thyroid issues.   

What is the best time to take a pregnancy test?

The best time of day to take a pregnancy test involves waiting until 7-10 days after conception, which is when it becomes most accurate and reliable.

Can implantation bleeding be lighter than a period?

Implantation bleeding tends to come on during menstruation, but it can sometimes be lighter and even shorter in duration depending on the individual woman’s cycle length.  

Which urine is best for ovulation test?

The best urine to use for an ovulation predictor kit (OPK) involves collecting it in the morning hours before you eat or drink anything, because that’s when LH levels are highest.   

Can you get positive ovulation test every month?

 It’s possible for women to get a positive ovulation predictor kit (OPK) result during periods of low fertility provided that they have a 28-day cycle length.  But keep in mind that these tests can also give false positives if LH surge isn’t present due to a hormonal imbalance.    

How can I check my ovulation date at home?

Once you check your first ovulation date, then it will be easy to track future dates through online forums or apps, which involve using two ovulation predictor kits (OPK) at the same time.   

What time of day is LH highest?

The best time of day to get an ovulation predictor kit (OPK) involves testing it at least twice between 6-10 am.  But keep in mind that LH levels are highest several hours after waking up, which is why you should wake up at the same time each morning.   

What makes an ovulation test positive?

An ovulation predictor kit (OPK) will turn positive when there’s a dramatic increase in LH present during menstruation, which leads to egg release and fertility.  In addition, these tests can also give false positives for women who have PCOS or other types of fertility issues as well.   


In this article, we covered the basics of fertility monitors and how to use them. We also discussed what a fertile window is, as well as some tips for predicting when it might happen. If you’re not sure about what time frame to base your measurement on, consult with a doctor before proceeding!

Leave a Reply

Your email address will not be published. Required fields are marked *