The majority of the research reveals that using Plan B does not cause any changes in the lining of the uterus (endometrium). 2 锘?Because Plan B does not have any effect on the endometrium,researchers have concluded that this emergency contraceptivecannot prevent implantation of a fertilized egg.
People also ask
Does Plan B work if the egg is fertilized?
If fertilization does occur, Plan B may prevent a fertilized egg from attaching to the womb (implantation). If a fertilized egg is implanted prior to taking Plan B, Plan B will not work. The morning after pill works by preventing ovulation, and thus preventing pregnancy.
How long does Plan B take to work after ovulation?
Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes. Does plan b work if you have already ovulated?
How does Plan B emergency contraception work?
The FDA labeling for the Plan B emergency contraceptive says Plan B may work by preventing implantation of the fertilized egg. This has created controversy over its use. Research, however, shows that Plan B does not work this way. Instead, it works by preventing ovulation and fertilization of the egg.
Is Plan B safe and effective?
Emergency contraception is safe and effective. Still, Plan B is controversial. Much of the debate is based on a misunderstanding about how Plan B works. Some people believe Plan B prevents a fertilized egg from implanting in the lining of the uterus. This belief is based on the product’s FDA labeling.