Likely the exercise: Many things can cause a slight delay in the onset of menses. Increased exercise is one of them. Do not be concerned if that is the only thing you notice, .
Answered 2/28/2014
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Irregular periods: Heavy exercise commonly affects menstrual cycles. It can range from irregular periods to complete absence of periods in women who are elete athletes in such activities as marathons. It probably isn't a problem, but if it persists, you should be checked out by your gynecologist.
Answered 4/7/2016
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