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A 17-year-old female asked:

What will be the other reason your period will delay after having sex except pregnancy?

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Some possibilities: 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… A home urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex. Pregnancy is the common cause of a missed period, if sexually active.

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Last updated Mar 23, 2015

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