What is your fertile window?

How knowing about your fertile window could help you become pregnant easily and quickly

Did you know that there are only a few days in your cycle that you can become pregnant?

It’s a fact. In each menstrual cycle there are just a few days that make up your fertile window when having intercourse is most likely to result in you becoming pregnant.

Charting your fertility by using the Fertility Awareness Method is an effective way to help you identify your fertile window, or those day in your cycle when intercourse is most likely to result in a pregnancy.  

Study finds a lack of fertility awareness could be a cause of infertility

A study published in the International Journal of Advanced Nursing surveyed 204 infertile women who were seeking Assisted Reproductive Technology (ART) to help them become pregnant.

Of those 204 women, 68% believed they successfully timed intercourse during their most fertile time each cycle. However, only 13% knew how to accurately identify their most fertile time to optimize a natural conception. This means that 87% of couples did not know how to identify their most fertile time.

Results of this study indicate that proper fertility awareness education is needed. 

Knowing about your fertile window will increase your chances of becoming pregnant

If you know when your fertile window is in each cycle and time intercourse during your fertile window, you have a much higher chance of becoming pregnant compared to those who are unaware of their most fertile time in their cycle.

You probably aren’t ovulating on day 14

You may have been told or perhaps assume that you ovulate or are most fertile on or around day 14 of your menstrual cycle.

This assumption is based on broad averages that may not be true for you even if your cycles are regular and exactly 28 days.

How your body tells you that you are fertile or ovulating

When you chart your fertility, you observe and record your body’s natural fertility signs which help you to identify your fertile window.

Your body provides you with so many clues that tell you about your fertility status throughout your cycle.

These fertility signs include your:

  1. Basal body temperature (BBT) which rises after you ovulate; and
  2. Your cervical fluid which becomes increasingly wet, clear and stretchy like egg white as you approach ovulation.  

There are 6 days in a cycle that you can become pregnant

The days when you are most likely to become pregnant are the days just before and on the day you ovulate.  

Human sperm can live for up to 5 days. You egg can live for up to one day.

This means your fertile window is at most six days made up of the five days before you ovulate and the day you ovulate.

But pregnancy is most likely to occur on just three days of your cycle

Though a pregnancy is possible during your entire six-day fertile window, most pregnancies result from having intercourse in the two days before you ovulate and the day of ovulation.

So, this makes for a fertile window of just three days in each cycle made up of the 2 days before you ovulate and the actual day of ovulation.

How fertility charting will help you find your fertile window

Your own fertility pattern and chart will be unique to you. Charting your fertility is going to help you identify your unique cycle pattern and find the days in your cycle that are your fertile window and when you are most likely to become pregnant.

When should you be having intercourse to become pregnant?

To improve your chances of becoming pregnant it is recommended that you have intercourse every day or at least every second day during your fertile window until you see a clear and sustained thermal shift (or a rise in your basal body temperature) on your chart.


Timing crucial in achieving pregnancy. (n.d.). Source: https://www.monash.edu/news/articles/timing-crucial-in-achieving-pregnancy