Peak Ovulation Day [How to Maximize Your Fertility]

Do you want to know how to determine your peak ovulation day to maximize your fertility?

Then you are in the right place!

In this post you are going to learn:

  • What is peak ovulation,
  • How long your fertility window lasts for each month,
  • The best days to have sex to optimize your chances of getting pregnant.

Are you ready?

Let’s get started.




Although I am a doctor, I am not your doctor. This information is for informational purposes only and should not substitute the advice from your healthcare professional. All kinds of exercise and dietary changes are potentially dangerous, and those who do not seek counsel from the appropriate health care authority assume the liability of any injury which may occur. Please read my full Disclaimer for more information. Also, this post may contain affiliate links: meaning I may receive a commission if you use them.

Ok, moving on.

When are you fertile?

You are fertile up to 5 days before you ovulate and up to 24 hours after ovulation.

It is only during this time each month that you can get pregnant.

Shocking, I know!

What this means is that you must have vaginal intercourse during this window to optimize your chances of getting pregnant.


What is peak ovulation?

Peak ovulation is the time at which you are most fertile, meaning your chances of becoming pregnant are at their highest.

Peak ovulation is 1-2 days before your body releases an egg, and the day that it is released.

What Causes The Egg To Be Released?

Each month, your body prepares for fertilization by recruiting and releasing one egg into your uterus.

It does this by growing ovarian follicles, each of which contains an egg.

Ultimately, only one follicle will grow, and become the dominant follicle.

Once that single follicle reaches a sufficient size, this will trigger your body to release really high levels of a hormone known as luteinizing hormone, or LH for short.

This is also known as “The LH surge.

The LH surge is what ultimately causes the egg to be released, or ovulated.

The really high level of LH that occurs Is known as the peak ovulation.

Once the egg is released, it can only survive in the female reproductive tract for 12-24 hours.

So get moving, the clock is ticking!

Do you ovulate the day after The peak?

So how long after the LH surge do you ovulate?

Most women will ovulate 1-2 days after the peak. (Average 36 hours).

But don’t forget, the fertile period begins at time of the LH surge.

Is peak ovulation before or after your period?

Peak ovulation occurs before your period.

If you think about it, every month your body is preparing for fertilization. If this does not occur, that is when you get your period.

Let’s go through each step individually.

  • The day you bleed is cycle day # 1
  • This starts the follicular phase of your menstrual cycle
  • Your body grows one dominant follicle which contains the egg to be released
  • The LH surge then occurs, triggering ovulation ~36 hours later
  • This is the most fertile day of your cycle
  • After ovulation, you are in the luteal phase of your menstrual cycle
  • The follicle that ovulated the egg becomes a corpus luteum
  • If no pregnancy occurs, you will have a period again.

A Simple Peak Ovulation Calculator (For Natural Family Planning)

The best way to calculate peak ovulation is to take a look at the length of your period.

In general, most women will ovulate 14 days before their period.

So if your periods are normally 30 days, you will ovulate around day 16.

Now, since you are most fertile, 1-2 days prior to ovulation, you would subtract 1-2 days from day 16.

So it would look like this:

(Average menstrual cycle length) – (14 days) -(1 or 2 days)

Another example:

If you have 28 day cycles, you can calculate your peak ovulation by using this formula:

(28) – (14 days) -(1 or 2 days) = 12 or 13

Days 12 and 13 of your cycle are going to be when you are most fertile. (Day 1 of your cycle is the day you start bleeding).

An ovulation calendar is helpful to determine your average menstrual cycle length.

An Even Easier Method – The Ovulation Test

Instead of calculating your ovulation, there is an easier way to determine your peak fertility.

You can use an ovulation predictor kit (OPK).

These devices can detect if there are high levels of LH in your urine. The good news is, studies have confirmed that these tests are reliable in predicting your high fertility days.

Clearblue is the most well known and the one I recommend.

You can get them here on Amazon.

Once you have a positive OPK, it’s time to have intercourse! This is what we mean when we say timed intercourse.

However, you still need to have a general idea of what days you should check the test, or else you will be going through a ton of kits.

If you have a 28 day cycle, begin checking the test strips nightly on Day 10.

If your cycles are longer than 28 days, you can add a day based on how much longer your cycles are and vice versa.

How long does ovulation last?

Ovulation is instant.

However, the egg that gets released through ovulation only survives for 12-24 hours.

The egg must travel to the fallopian tube and be fertilized by sperm within this time frame.


If the egg does not get fertilized by a sperm within this time frame, you have lost your window this cycle.

How long after ovulation can you conceive?

You can only conceive 12-24 hours from ovulation.

However, you can conceive 1-2 days before ovulation because sperm can survive in the female reproductive tract for 3-5 days!

Do you ovulate in the morning or night?

Research shows that the LH surge occurs in the evening to early morning.

Once you have ovulated, you have 12-24 hours for your egg to be fertilized by sperm.

Therefore, you should have intercourse that evening as well as the next morning to optimize your chances of getting pregnant.

How do I know ovulation is over?

The most common indicators of ovulation include:

  • changes in your cervical mucus,
  • an elevation in your basal body temperature,
  • elevations of serum progesterone levels

Peak fertility is associated with slippery and clear mucus.

When ovulation is over, the cervical mucus will become sticky and thick which prevents sperm from getting to the uterus.

You may even experience days where there is very little to no discharge.

Another way to detect that ovulation is over is by checking your basal body temperature.

Your body temperature will increase by about 0.5 degrees celsius AFTER you ovulate.

This is very difficult to truly detect, and very impractical.

Additionally, a blood test looking at progesterone levels will also confirm if ovulation has occurred or not.

Other Related Question

What does ovulation discharge look like?

Ovulation discharge is very wet and stretchy.

Some will refer to this type of discharge as a raw egg white appearance.

The reason for this very wet discharge is so that sperm can easily enter the cervix and travel up the uterus to meet and fertilize the egg.

How long does sperm survive in the female body?

Sperm could survive in the female body for up to 5 days.


However some sperm may die before 5 days depending on the conditions in the female reproductive tract, mainly the vagina, cervix, uterus and fallopian tubes.

In particular, certain types of birth control will cause the female reproductive system to become inhospitable for sperm resulting in sperm death.

Can I get pregnant on my peak day?

Yes, you can get pregnant from intercourse that occurs on your peak LH day. In fact this is the day where you are most fertile.

Can I get pregnant 2 days after ovulation?

It is possible for you to get pregnant 2 days after ovulation, but it is very unlikely.

Typically you are fertile only up to the day of ovulation.

What are the signs of a woman not ovulating?

The most common sign that you are not ovulating is irregular or infrequent periods.

A normal menstrual cycle is 21-35 days.

If you have cycles that last longer than 35 days, (some women have 60+ day cycles), you are not ovulating.

What are the reasons why you are not ovulating?

The most common causes why you are not ovulating is due to your hormonal profile.

The most common causes of an irregular cycle or anovulatory cycles are:

  • Polycystic ovarian syndrome or PCOS
  • Hypothyroidism
  • Hyperprolactinemia
  • Being severely underweight with a BMI <18.5

If you have any of these conditions, please speak with your medical provider as they are all treatable!

When should I see a fertility specialist?

You should consult a fertility doctor if you have been unable to achieve pregnancy after:

  • 12 months of regular unprotected intercourse if you are under 35 years
  • 6 months of regular unprotected intercourse if you are over 35 years
  • Immediately if you are 40 years or over
  • Immediately if you have a known diagnosis that causes infertility

Final Words on Finding Your Peak Fertility

So there you have everything you need to know about ovulation and the optimal timing to get pregnant.

Isn’t it so interesting how there are only certain days during the month in which you could get pregnant?

Share this with anyone who can benefit from fertility awareness!

Now I want to hear from you.

Are you planning your pregnancy based on your ovulation?

Are you going to use an ovulation test?

Comment below and let me know!


Related Posts On Conceiving


  1. Stanford JB, Dunson DB. Effects of sexual intercourse patterns in time to pregnancy studies. Am J Epidemiol. 2007 May 1;165(9):1088-95. doi: 10.1093/aje/kwk111. Epub 2007 Feb 8. PMID: 17289774.
  2. Wilcox A.J, Weinberg C.R, Baird D.D. Timing of sexual intercourse in relation to ovulation—effects on the probability of conception, survival of the pregnancy, and sex of the baby.New Engl J Med. 1995; 333: 1517-1521
  3. Su HW, Yi YC, Wei TY, Chang TC, Cheng CM. Detection of ovulation, a review of currently available methods. Bioeng Transl Med. 2017;2(3):238-246. Published 2017 May 16. doi:10.1002/btm2.10058
  4. Clubb E. Natural methods of family planning. J R Soc Health. 1986 Aug;106(4):121-6. doi: 10.1177/146642408610600402. PMID: 3091823.

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Brittany N Robles, MD, MPH, CPT

Brittany Robles is a full-time OBGYN, a NASM certified personal trainer, and health & fitness, expert. She holds a Masters of Public Health degree in maternal health with a special interest in exercise and nutrition. She is also the co-author of The White Coat Trainer. Learn more about her here.

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6 thoughts on “Peak Ovulation Day [How to Maximize Your Fertility]”

    1. Brittany Robles, MD, MPH, CPT

      Hi Thara,

      Thanks for your comment!

      The LH surge precedes ovulation by 24-48 hours.

      During the surge, the LH value can be anywhere between 20-75.

      At the time of ovulation, the LH level returns to normal levels.

      Hope this helps!

  1. I had a Mirena coil removed 3 weeks ago and was told my period should return within 21 days. I haven’t had a period yet, so have been unable to work out my cycle and start using the ovulation test. After 21 days I thought I would test anyway and just see what it said, and it was ‘Peak’! 48 hours later, I tested again and it still says ‘Peak’. Is this normal?

    1. Brittany Robles, MD, MPH, CPT

      Hi Charlie,

      Thanks so much for your comment.

      So the ovulation predictor kit, or OPK for short, is solely detecting the rise in the LH hormone. Some women can actually have an elevated LH hormone for 48 hours and thus that could be the explanation for why it was still positive.

      Hope this helps!

  2. Hi , thanks for all your information . I just have a quick question as it’s really surprising le ! How come I can see high peak ( flashes smile in clear blue ) and just the day next i see clear circule which means nothing detected fir both hormones , while I was expecting to see peak or ah least stays in high for still few more days . Is it normal ? Or women can ovulate twice so high fertility happens then stop then go again with high then peak ! Thanks

    1. Brittany Robles, MD, MPH, CPT

      It’s not uncommon for the peak to only last one day. Different tests will have different levels of sensitivity for detecting the hormones as well, so they aren’t 100% accurate all the time. The most important thing is that you did get a positive result!

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