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The calendar is a man-made invention, your body has no way of knowing what date it is to know when it 'should' be ovulating or menstruating. When you menstruate is determined by your menstrual cycle, your menstrual cycle may be longer than a month (not to mention different months have a different number of days), menstrual cycles can also vary by up to a week or your cycles can be longer when you're stressed. You determine when your period is due based on your cycle, not the date.

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Q: Why does your period change dates?
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