Answer:

The average menstrual cycle lasts 28 days. The variability of menstrual cycle LENGTHS is highest for women under 25 years of age and is lowest, that is, most regular, for ages 25 to 39. Subsequently, the variability increases slightly for women aged 40 to 44.

Work out the length of your average menstrual cycle. Day one is the first day of the menstrual period and the last day is the day before the next period begins.

Ovulation happens about two weeks before the next expected period. So if your average menstrual cycle is 28 days, you ovulate around day 14.

Remember the ‘fertile window’(likelihood to get pregnant) is the six days leading up to and including ovulation.

within the 6 days leading to ovulation, The three days leading up to and including ovulation are the most fertile. this varies depending on your cycle length.

If you have 28 days between periods ovulation TYPICALLY happens on day 14, and the most fertile days are days 12, 13, and 14.

If you have longer cycles, say 35 days between periods, ovulation happens on day 21 and the most fertile days are days 19, 20, and 21.

If you have shorter cycles, say 21 days between periods, ovulation happens on day 7 and the most fertile days are days 5, 6, and 7.