It is unlikely you would become pregnant from this incident. First, your partner did not ejaculate inside of you. Second, the last days of your period should still be within your (relatively) infertile time. Third, you took Plan B within 24 hours.
Plan B helps prevent pregnancy by delaying ovulation. After taking Plan B, you may experience some irregular bleeding or spotting. Your next period may be earlier or later than normal. It may be lighter, heavier or spottier than usual. Wait until your period is more than 1 week late. If it still hasn’t come, then repeat the pregnancy test.
17. February 2012
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