The sooner you act after having unprotected sex, the better. Emergency contraception is a way of preventing pregnancy after you have had sex without using contraception or when contraception has failed. If you take the emergency contraception (pill) or have an intrauterine device (coil) fitted within 5 days it will usually prevent pregnancy. Emergency contraception does not cause an abortion. Emergency contraception does not protect you from sexually transmitted infections. Please note the Emergency contraception (morning after pill) can be obtained from most Pharmacies.