Some thoughts...: In a woman with regular periods, some causes of a late period include: excessive weight loss or gain, increased exercising, emotional stress, having an illness, traveling, medicines (but maybe not the cephalexin, paracetamol, or ibuprofen), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent. Pregnancy is a cause of a missed period (one can retest in 1 week).
Answered 12/28/2015
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