Before you can estimate the days a woman is most fertile, it helps to understand how the body changes during a menstrual cycle, particularly in relation to the various physical signs.
By starting from day one (the first day of a menstrual period) you can record your findings on a fertility chart to assist with conceiving a baby.
NOTE: This information is based on a 28 day menstrual cycle. However, if you are not experiencing a regular 28 day cycle, we provide examples of adjustments you need to make if your cycle is longer or shorter. Be aware that different cycle lengths change the timing of the estimated fertile days, so you can’t always rely on just ‘counting the days’. This is why other physical signs are taken into account.
Read more; there are 5 phases in a normal menstrual cycle: