Was test 3 wk later?: 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. If the pregnancy test was negative 3 weeks after Plan B, that means not pregnant... but it's fine to repeat the test after another 7 days if worried.
Answered 9/27/2015
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