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. read more
Once you have the dates, you will need to count the number of days between the two dates on a calendar. “Day One” will be the day you start bleeding and the final day, of your cycle, will be the day before your period started the next month. read more
To calculate your ovulation by tracking your cervical mucus, keep a calendar and track your period and the length of time between each period for 8-12 months. Once you have at least 8 months charted, subtract 18 from the number of days in your shortest period to get your first fertile day in each cycle. read more