You can use your calendar or the Birth Control pill package.
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The typical menstrual cycle is around 28 days in length.But everyone is different and menstrual cycles can vary by a few days from cycle to cycle.
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The average menstrual cycle lasts 28 days, from the start of menstruation to the start of the next menstruation. The "bleeding phase" typically lasts 5-7 days.
The first day of your current menstrual cycle (the first day you begin to bleed again) is also your last day of your previous cycle. The average length of the cycle is 28 days. The first day of your current menstrual cycle (the first day you begin to bleed again) is also your last day of your previous cycle. The average length of the cycle is 28 days.
you could use a calender to count off the days.