Contents: Research LetterRisk of Pregnancy With Levonorgestrel-Releasing Intrauterine System Placement 6–14 Days After Unprotected Sexual IntercourseBoraas, Christy M. MD, MPH; Sanders, Jessica N. PhD, MSPH; Schwarz, E. Bimla MD, MS; Thompson, Ivana MD, MSCI; Turok, David K. MD, MPHAuthor Information University of Minnesota Medical School, Minneapolis, Minnesota; the University of Utah School of Medicine, Salt Lake City, Utah; the University of California Davis School of Medicine, Sacramento, California; and Vanderbilt Health, Nashville, Tennessee. Corresponding author: Christy M. Boraas, MD, MPH, Department of Obstetrics, Gynecology and Women's Health, University of Minnesota Medical School, Minneapolis, MN; email: [email protected]. Financial Disclosure The authors did not report any potential conflicts of interest. Components of this project were supported by the Society of Family Planning Research Fund, the William and Flora Hewlett Foundation, and the Susan Thompson Buffett Foundation. Bayer Women's Healthcare contributed the levonorgestrel-releasing intrauterine system products for the HER Salt Lake Contraceptive Initiative. Use of REDCap provided by Eunice Kennedy Shriver National Institute of Child Health and Human Development grant (8UL1TR000105 (formerly UL1RR025764) NCATS NIH). Team members receive support from the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the Office of Research on Women's Health of the National Institutes of Health, JNS via Award Number K12HD085852 and DKT via K24HD087436 and 1R01HD083340. Clinical trial registration: Quick Start NCT02076217, RAPID EC NCT 01963962, COLIEC NCT02734199, HER Salt Lake NCT02175030. The authors thank the staff of Planned Parenthood MN-ND-SD and Planned Parenthood Association of Utah for assistance in the execution of this study. Presented at the American Society for Reproductive Medicine’s Scientific Congress, October 15–19, 2016, Salt Lake City, Utah. The content is solely the responsibility of the authors and does not necessarily represent the official view of any of the funding agencies or participating institutions, including the National Institutes of Health or Planned Parenthood Federation of America, Inc. Each author has confirmed compliance with the journal's requirements for authorship. Peer reviews and author correspondence are available at http://links.lww.com/AOG/C230. Obstetrics & Gynecology: April 2021 - Volume 137 - Issue 4 - p 623-625 doi: 10.1097/AOG.0000000000004118 Buy SDC Metrics In Brief Pregnancy is unlikely when a levonorgestrel-releasing intrauterine system (52-mg) is placed 6–14 days after unprotected intercourse. © 2021 by the American College of Obstetricians and Gynecologists. Published by Wolters Kluwer Health, Inc. All rights reserved.