August 1st, 2011, 08:36 PM
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Platinum Supermommy
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Join Date: Aug 2006
Location: Alberta, Canada
Posts: 10,160
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Scientifically speaking, its' the first day of actual flow requiring more than a pantyliner....but it's only a true menstruation if ovulation has occurred first. If ovulation has not yet occurred, it could be another kind of bleeding and is not considered the start of a new cycle.
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