How long is the effectiveness of emergency contraception?

Patient's question:

Medical Description: Please ask if you cannot eat anything two hours before and after taking birth control pills?
History of Treatment and Effect: Haven't tried it before.
Expected Help: Hope to get an accurate answer. Thank you.

Doctor's answer:

Hello! If you experience contraceptive failure or have unprotected sex, you should take emergency contraception within 72 hours (the earlier the better) by mouth. After taking emergency contraception, you should not have any more unprotected sex during this menstrual cycle. If you do, you should use conventional contraception methods. If your period is delayed, you should go to the hospital for a pregnancy test to determine if the emergency contraception failed. Taking emergency contraception can affect your menstrual cycle, so calculating your safe period for the following few months will be more difficult. Women should try to use highly effective contraception methods after this.

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