is it normal for your period to change dates
The menstrual cycle, which is counted from the first day of one period to the first day of the next, isn't the same for every woman. Menstrual flow might occur every 21 to 35 days and last two to seven days.For the first few years after menstruation begins, long cycles are common.racking your menstrual cycles can help you understand what's normal for you, time ovulation and identify important changes â such as a missed period or unpredictable menstrual bleeding.