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Charlotte, North Carolina
A 19-year-old female asked:

What can cause your period to be late besides pregnancy? i'm on birth control and i've already had a period since the last time i had protected sex.

1 doctor answer2 doctors weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
Late period.: Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; Over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives & other meds, Illegal drug use, breast feeding, hormone imbalances and medical problems (i.e., PCOS). Pregnancy is #1 reason.

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Last updated May 18, 2017

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