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A 23-year-old female asked:

Took plan b period is five days late. negative pregnancy test and blood work. whats going on,?

1 doctor answer1 doctor weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Hormone imbalance: Plan B has a higher dose of birth control hormones and may upset the usual cycle. It would be prudent to repeat the pregnancy test in 4-5 days if you do not get a period by then.

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Last updated Mar 21, 2015

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