I am on birth control but last week had to take antibiotics for strep I know there is a possibility that the effectiveness of the pill lessens, my bf and I had unprotected sex because I wasn’t thinking(I was done taking the antibiotics the same day that we had unprotected sex). My friend and I talked the next day and she said it was a good idea to get plan b, so I did. The next day my bf and I had sex again but it wasn’t until a little later into the act I remembered to get a condom. He did not ejaculate in me but was still in me unprotected. Would getting plan b be a good idea again? Would the antibiotics have any affect on plan b? Is there a possibility I could get pregnant?

8. February 2012

Some antibiotics will decrease the effectiveness of your birth control pills. Recommendations are to use a back up birth control method for the time you’re on the antibiotics and for at least 7 days after completion of the antibiotics. Therefore, the effectiveness of your pills may not have been 100%. Anytime you have unprotected intercourse, there is the risk of pregnancy.

You probably do not need to take Plan B again, especially if you have continued to take your birth control pills on a daily basis. During this next month, you may experience some irregular bleeding or spotting. Your period may be a little earlier or later than usual, even though you’re taking the pills.

If your period is more than 1 week late, perform a pregnancy test.

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