Regular Periods: Menses follow a lunar calendar. Since our calendar month has 30 to 31 days, it is possible to have you period twice a month. However there should be 23 to 35 between the start of one to the next.
Answered 1/15/2017
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Somtimes: Since most menstrual cycles are about 28 days long (can be 23 to 35 days) it is possible to have two cycles in a month. The bleeding should not occur less than 21 days apart.
Answered 2/17/2015
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