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.
Keep a Record. You need to count the number of days between the first day of your period and the first day of your next period. This determines your cycle length, which for most women is 28 days, but it can be anywhere between 25 and 35 days. Once you know the first and last days of your period, keep a record of it. Highlight these days on a calendar to get an idea of when your next period might come.