A member asked:

Why is my girlfriends period starting earlier than usual every month?

A doctor has provided 1 answer

Have to count days: Because each calendar month is 30-31 days, except february, what happens when a woman has normal 28-day periods? Every month, her period will start on an "earlier" numerical day, except for in march. In march, her period should start on the same day it did in february, because february has 28 days. Of course, real life is not so exact (even 28-day periods vary a bit.

Answered 12/9/2013

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