Hello,
Thank you for your question. Emergency
contraception (EC) refers to the
contraceptive options that can decrease the risk of
pregnancy after intercourse but before the establishment of a pregnancy. These methods can be used after intercourse when no contraception was employed (ie,
unprotected intercourse, a method was used imperfectly (ie, a condom slipped for broke, pill or injection was missed), or sex was forced without use of contraception.
Oral 72 morning after pill (Levonorgetrel) can be taken up to 72 hour (3dayss) after unprotected sex. Take the pills as soon as possible after you have sex. The pills can work up to 5 days after you have sex, but the sooner you take them, the better they work.
Hormonal emergency contraception works best if you take it within 3 days of having unprotected sex. It is less effective if you take it 3 to 5 days after unprotected sex. I it has been 3 or more days since you had unprotected sex, Ulipristal or the copper IUD might be better option for you. Both are more effective than hormonal emergency contraceptiion if it has been 3 to 5 days since you had unprotected sex. If you have sex again after you take the pills, you can still get pregnant. Make sure you use condom or another types of birth control if you have sex again after you took emergency contraception.
Levonorgestrel prevents pregnancy about 50 percent of the time. If You weigh 165 pounds (75kg) or more, the pills might not work well and you might want to get a copper IUD instead.
Hope I have answered your query. Let me know if I can assist you further.
Best regards,
Dr. Heang Chan Raksmey, General and Family Physician.