Emergency Contraception By Frances E Casey, MD, MPH, Virginia Commonwealth University Medical Center Reviewed / Revised Feb 2022 | Modified Sep 2022 View Patient Education Key Points Commonly used emergency contraception regimens include Insertion of a copper - bearing T380A IUD within 5 days of unprotected intercourse Insertion of a 52-mg levonorgestrel - releasing IUD, which, like the copper - bearing IUD, probably requires insertion within 5 days of unprotected intercourse Levonorgestrel 1.5 mg orally once within 120 hours of unprotected intercourse Ulipristal acetate 30 mg orally once within 120 hours of unprotected intercourse For women who have regular menses, the risk of pregnancy after a single act of intercourse is about 5%.