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How does Plan B work?

The Plan B/ the"morning after" pill/emergency contraception contains the hormone levonorgestrel (a progestin) which can stop the person taking it from ovulating, block fertilization and/or keep a fertilized egg from implanting in the uterus. Plan B must be taken within 72 hours of unprotected sex or contraceptive failure - including condom breakage - but is more effective the sooner it is taken.


A pregnancy test is the only way to confirm whether or not Plan B has been effective, and should be taken after the first day of a missed period.

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