Usually works but...: Taking emergency contraceptive pills (such as i-Pill or Plan-B) can alter the timing or vaginal bleeding of the current cycle and the upcoming cycle. If one's menstrual cycle was regular before this, one can await for it to return to being regular... but it may take a few weeks, or 1-2 menstrual cycles. One should do a home urine pregnancy test 3 weeks after sex, to be sure there is no pregnancy.
Answered 1/27/2018
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