Yes, it's possible to get pregnant. The morning-after pill (AKA Plan B or emergency contraception) can help prevent pregnancy when you take it after having unprotected sex. But, it won't prevent pregnancy for any sex you may have after taking it.

The morning-after pill is super safe, and Plan B side effects aren't super common. There have been no reports of serious problems out of the millions of people who've taken it. After you take the morning-after pill, it's totally normal for your next period to be different from what you're used to.

Plan B One-Step works before release of an egg from the ovary. As a result, Plan B One-Step usually stops or delays the release of an egg from the ovary. It is one tablet that contains a higher dose of levonorgestrel than birth control pills and works in a similar way to prevent pregnancy.

Plan B One-Step is a type of morning-after pill that can be used after unprotected sex to prevent pregnancy. Plan B One-Step contains the hormone levonorgestrel - a progestin - which can prevent ovulation, block fertilization or keep a fertilized egg from implanting in the uterus.

There is no limit to the number of times an individual can take Plan B, or the emergency contraceptive pill. People can take it as often as necessary to prevent an unplanned pregnancy. There are no significant health risks associated with the use of Plan B.

How long it's been since you had unprotected sex - you have up to 5 days after unprotected sex to use emergency contraception. Plan B works better the sooner you take it. Plan B doesn't work nearly as well after 3 days (72 hours).

Plan B is up to 89% effective at preventing pregnancy if taken within 72 hours (3 days) of unprotected sex. It's very safe, well-tolerated, and won't affect future fertility. Plan B isn't effective during or after ovulation.

How effective is emergency contraception? EC is most effective within the first 12-24 hours after unprotected sex. The sooner you start EC after unprotected sex, the better it will work. Depending on the brand of EC, it may be effective up for to 5 days (120 hours) after unprotected sex.

The bottom line. Common Plan B side effects include a heavier next period, nausea, and stomach pain. Headache, breast tenderness, and a delayed period are also possible. Plan B side effects should be mild and quick to pass.

Plan B is up to 89% effective at preventing pregnancy if taken within 72 hours (3 days) of unprotected sex. It's very safe, well-tolerated, and won't affect future fertility. Plan B isn't effective during or after ovulation.

Emergency contraceptive pills are most effective the sooner you take them, but can still have some effect for up to 4-5 days (96-120 hours) after unprotected sex. Emergency contraceptive pills might be far less effective, or ineffective, during roughly 1-2 days of each cycle, right around the time of ovulation.

Taking the morning-after pill (also known as emergency contraception) multiple times doesn't change its effectiveness, and won't cause any long-term side effects. You can use the morning-after pill whenever you need to.