Australian Stories may contain the names and images of Aboriginal and Torres Strait Islander people now deceased. Australian Stories also contain links to sites that may use images of Aboriginal and Islander people now deceased.
1 Record the number of days in each cycle, including the day you start your period. 2  The last day of each cycle is the day before your next period starts. 3  Keep tracking your cycle this way for eight to twelve cycles. 4  The more cycles you have to reference, the more accurate the calendar method will be.
First of all, you need to start by figuring out how long your average menstrual cycle is. You count day one as the first day of your period and your cycle goes until you start your period again. Keep track of the days, and once you start your period again, the day before that is the last day of your ovulation cycle. Most women have a cycle of between 28 and 30 days.