Anytime you have unprotected intercourse, there is the risk of pregnancy.
Plan B helps prevent pregnancy by delaying ovulation. When taken within 24 hours after unprotected sex, it is about 75% to 80% effective. The Plan B that you took in the morning would probably still be effective for the unprotected intercourse that you had that night. However, having repeated incidents of unprotected sex after Plan B could actually increase your risk of pregnancy, depending on where you’re at in your cycle. So be sure to use condoms until you have your next period.
If your next period is more than 1 week late, do a pregnancy test.
11. April 2012
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