How does the morning after pill work?
Emergency contraceptive pills, like ellaOne®, work by inhibiting or delaying ovulation.
They work to prevent pregnancy after unprotected sex by postponing ovulation if it has not already happened. This means the sperm waiting in the fallopian tubes will be unable to meet an egg and fertilise it. This is similar to regular contraceptive pills, which also work by preventing egg release.
Emergency contraceptive pills are not 100% effective. This is because there is a chance that you may have already ovulated when you take an emergency contraceptive pill. Taking emergency contraceptive pills as soon as possible after unprotected sex gives the best chance of success.
The sooner you take emergency contraceptive pills, the better·
- Emergency contraceptive pills are not 100% effective
- ellaOne® is still effective when risk of pregnancy is highest
- The sooner after unprotected sex you take emergency contraception, the better the chance of successfully postponing ovulation and avoiding pregnancy.
- Emergency contraceptive pills will not protect you from pregnancy if you have further unprotected sex.
If you want to have sex after using an emergency contraceptive pill, use a barrier method of contraception until your next period.