If you are already pregnant, Plan B will not terminate your pregnancy. Plan B prevents you from becoming pregnant in the first place by delaying ovulation (the monthly release of an egg) and possibly interfering with fertilization (the union of sperm and egg) and implantation (when a fertilized egg implants itself in the uterine wall). Plan B should be used within the first three days after unprotected sex, but it can be used up to five days after sex with decreased effectiveness.
14. March 2012
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