A 24-day cycle: A 24-day cycle is normal in some women, but an early menstrual period may be caused by changes in hormone levels, which can be due to anxiety, stress, overworking, intense exercise, fatigue, or excessive weight gain/loss. If pregnancy happened, implantation bleeding occurring 9-14 days after conception may happen, and sometimes may last long enough to mimic an early period.
Answered 5/31/2013
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