Do After Morning Pills Work?

If you take the pill within 72 hours after you've had unprotected sex, levonorgestrel can reduce the risk of pregnancy by up to 87% if taken as directed. If you take Plan B One-Step within 24 hours, it is much more effective. But you should know that Plan B One-Step is not as effective as regular contraception.

How long does it take for the morning after pill to work?

At a glance: facts about emergency contraception

You need to take the emergency contraceptive pill within 3 days (Levonelle) or 5 days (ellaOne) of unprotected sex for it to be effective – the sooner you take it, the more effective it'll be.

Can morning after pills fail to work?

It can remain there for up to 10 years as a regular form of contraception. There is a chance that the morning after pill can fail and you can fall pregnant. If your period is late/delayed, light or shorter than normal, consider having a pregnancy test.