If you had unprotected sex or if the condom was torn, you can choose to have an intrauterine device (IUD) inserted.
This must be done within five days after unprotected intercourse.
It’s called an emergency IUD because of the circumstances in which it’s put in. But in fact it’s a normal IUD that will protect you for years. If you don’t want to keep it in you can have it removed after you have had your period.
You have to visit a clinician to have it placed.

See also: morning-after pill