Emergency contraceptives are medications designed to prevent pregnancy after unprotected sex or contraceptive failure, such as a broken condom. They work primarily by delaying or inhibiting ovulation, which is the release of an egg from the ovaries. Common types include levonorgestrel and ulipristal acetate, which can be taken within a few days after intercourse. These medications are not the same as abortion pills and will not terminate an existing pregnancy. Emergency contraceptives are most effective when taken as soon as possible after the incident, and they are available over-the-counter in many countries without a prescription.