Pregnancy is highly unlikely given the steps you have taken (there is always a slight risk of pregnancy even when pills are used perfectly). If she missed her pill by less than 24 hours, we would not have recommended Plan B use.
However, since she did use it, her next period may be unusual. It may come early or a little later than usual. She may even experience some spotting in between periods. If she doesn’t have any bleeding at all during her inactive pills (sugar pills), she should take a pregnancy test (just in case). But again, pregnancy is extremely unlikely.
19. March 2012
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