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Plattsburgh, NY
A 19-year-old female asked:

Is a negative pregnancy test taken after period is 8 days late accurate? took plan b and second period is late.

2 doctor answers4 doctors weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
Likely accurate: Potential Side effects w emergency contraception include menstrual flow changes (spotting, bleeding, early or late period). Take pregnancy test & notify Dr if your period is 7 or > days late.
Dr. Tanya Russo
Pediatrics 25 years experience
Maybe (not): It depends on how soon after the encounter you took the Plan B (with 72 hours). The hormones from the Plan B may have disrupted your cycle a bit too. A pregnancy test if your period doesn't come soon would be wise.

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Last updated May 18, 2015

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