Background:  The copper intrauterine device (Cu T380A IUD) is highly effective, hormone free, and the most effective form of emergency contraception (EC).  Women seeking EC often report multiple episodes of unprotected intercourse (UPI). Currently, the Centers for Disease Control and Prevention’s Selected Practice Recommendations limit placement of the Cu T380A IUD to the first five days after UPI to avoid the theoretical risk of disrupting a luteal phase pregnancy. Limited data suggest a low probability of pregnancy among women who had a copper IUD inserted 6-14 days after UPI with a negative urine pregnancy test (UPT).
 Objective: To determine the pregnancy rate when a Cu T380A IUD is placed 6-14 days after UPI with a negative UPT on the day of insertion.
 Methods:  This is a multi-site observational study of reproductive age women reporting UPI 6-14 days prior to Cu T380A IUD placement. All participants had a negative high-sensitivity UPT on the day their IUD was placed. Participants provided informed consent acknowledging the possibility of experiencing a luteal phase pregnancy. Data was collected on timing of UPI and participants’ menstrual and sexual history. Two weeks after IUD placement, participants completed a home UPT and a follow up survey (via telephone, email, or text message) about their home UPT results and experiences with IUD placement.