A 21-year-old female asked:
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i had sex on 09/02, on cd11 and took plan b. i have a 34 day cycle. i had light bleeding on cd33 and 34. could this be implantation bleeding?

1 doctor answer
Dr. Robert Kwok
32 years experience Pediatrics
About Plan B...: Plan B can alter the menstrual bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time but not all the time. A person cannot say some spotting was implantation unless there was later a positive pregnancy test.
Answered on Oct 19, 2018
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