Some thoughts...: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent or worrisome. Pregnancy can be a cause of a missed period, but unlikely with negative test.
Answered 12/20/2015
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