Rates of pregnancy among levonorgestrel and copper intrauterine emergency contraception initiators: Implications for backup contraception recommendations.

Objective: This study assessed the timing, frequency, use of backup method and 1-month pregnancy rates among individuals who had an intrauterine device (IUD) placed as emergency contraception and reported intercourse within 7 days post-placement.

Study Design: In this secondary analysis of a randomized control trial of IUDs for emergency contraception, 518 individuals reporting unprotected intercourse in the preceding 5 days had a 52 mg levonorgestrel intrauterine system (IUS) or 380 mm copper IUD placed outside the first week of their menstrual cycle. All participants were advised to use backup contraception for 7 days.