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Each month a female’s body prepares for pregnancy. Women normally experience menstrual cycles for the purpose of cleansing the body of waste. A normal ovulation-menstrual cycle is 28 days long. In young teens, cycles can range from 21-45 days; while in adults, cycles can range anywhere from 21-35 days. If you want to know the count of your ovulation, you need to know the average length of your menstrual period. Usually, the last day of your period is the day before the next period occurs. Ovulation happens about two weeks before the next expected period.