As women and their cycles are different, ovulation varies depending on the length of your cycle, which can range from 21 days up to 35 days.
Let’s have a look at two examples:
Ovulation happens about 14 days before your menstruation starts. That means: if your average menstrual cycle for example is 28 days, you ovulate around day 14, and your most fertile days are days 12, 13 and 14. If your average menstrual cycle is 35 days ovulation happens around day 21 and your most fertile days are days 19, 20 and 21. How to count your cycle? The first day of your menstruation is the beginning of a new cycle, hence day 1.