Menstrual cycles: Is the 21-24 day cycle length from the beginning of one cycle to the beginning of the other or from the end to the beginning. If it is the former, then that would be a short cycle and you should see a doctor to find out why it is short. If it is the latter and your cycle lasts 5-6 days, then it would be a normal 26 - 30 day cycle length.
Answered 5/3/2013
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