The ‘morning-after’ pill is a high doses birth control pill. It is used to reduce the risk of pregnancy after you had sex.
The morning-pill works after a girl had sex, but before she becomes pregnant. It’s not a normal method of birth control, but rather an emergency measure afterwards, when the condom was torn or the girl discovers a tiny hole in her diaphragm after intercourse.
The term ‘morning-after’ is misleading. You can take the first 2 pills immediately after unprotected intercourse, or at any time up to 72 hours later. The sooner you take them the greater the efficacy. The term ‘pill’ is also misleading, because there are more than one pill. The first pills you take as soon as possible; after a 12 hour wait you take the rest of the pills.
If more than 72 hours have passed you can use an emergency IUD.

Where do I get the morning-after pill?