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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Medical Education ](https://mdster.com/blog?category=medical-education) 4. Emergency Contraception Options: Timing, Selection, and Pitfalls [ Medical Education ](https://mdster.com/blog?category=medical-education) Emergency Contraception Options: Timing, Selection, and Pitfalls ================================================================== Choose copper IUD, levonorgestrel, or ulipristal—and get the follow-up right. [ MDster Editorial Team ](https://mdster.com/about) · Sep 20, 2026 · 6 min read · 46 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Obstetrics & Gynecology ](https://mdster.com/blog?tag=obstetrics-gynecology) [ Reproductive Health ](https://mdster.com/blog?tag=reproductive-health) [ Emergency Contraception ](https://mdster.com/blog?tag=emergency-contraception) [ OB-GYN Board Review ](https://mdster.com/blog?tag=ob-gyn-board-review) [ Contraceptive Counseling ](https://mdster.com/blog?tag=contraceptive-counseling) ![Emergency Contraception Options: Timing, Selection, and Pitfalls](https://mdster.com/storage/blog/images/emergency-contraception-options-timing-selection-and-pitfalls.jpg) Share this article Share this post On this page 1. [ Think in Two Clocks: Intercourse and Ovulation ](#think-in-two-clocks-intercourse-and-ovulation) 2. [ Copper IUD: Offer the Most Effective Option ](#copper-iud-offer-the-most-effective-option) 3. [ Apply the Timing Exception Correctly ](#apply-the-timing-exception-correctly) 4. [ Oral EC: Similar Goal, Different Limitations ](#oral-ec-similar-goal-different-limitations) 5. [ Levonorgestrel: Earlier Is Better ](#levonorgestrel-earlier-is-better) 6. [ Ulipristal: Better Near Ovulation, Not After It ](#ulipristal-better-near-ovulation-not-after-it) 7. [ Let Patient Factors Refine the Choice ](#let-patient-factors-refine-the-choice) 8. [ The Restart Plan Is Part of Treatment ](#the-restart-plan-is-part-of-treatment) 9. [ Key Takeaways ](#key-takeaways) 10. [ Frequently Asked Questions ](#blog-faqs) 11. [ References ](#references-heading) On this page 1. [ Think in Two Clocks: Intercourse and Ovulation ](#think-in-two-clocks-intercourse-and-ovulation) 2. [ Copper IUD: Offer the Most Effective Option ](#copper-iud-offer-the-most-effective-option) 3. [ Apply the Timing Exception Correctly ](#apply-the-timing-exception-correctly) 4. [ Oral EC: Similar Goal, Different Limitations ](#oral-ec-similar-goal-different-limitations) 5. [ Levonorgestrel: Earlier Is Better ](#levonorgestrel-earlier-is-better) 6. [ Ulipristal: Better Near Ovulation, Not After It ](#ulipristal-better-near-ovulation-not-after-it) 7. [ Let Patient Factors Refine the Choice ](#let-patient-factors-refine-the-choice) 8. [ The Restart Plan Is Part of Treatment ](#the-restart-plan-is-part-of-treatment) 9. [ Key Takeaways ](#key-takeaways) 10. [ Frequently Asked Questions ](#blog-faqs) 11. [ References ](#references-heading) A patient presents 96 hours after condom failure and asks for “the morning-after pill.” Don’t reflexively recommend levonorgestrel: at this interval, ulipristal is the stronger oral option, and a copper IUD offers the greatest efficacy. The clinical task is matching treatment to timing, preferences, and the next contraceptive step. [\[1\]](#cite-1 "Reference [1]") *September 2026 review: based on CDC recommendations and Society of Family Planning guidance reaffirmed in April 2026.* [\[2\]](#cite-2 "Reference [2]") Think in Two Clocks: Intercourse and Ovulation ---------------------------------------------- Ask when **every episode of unprotected intercourse** occurred, not just the most recent one. Establish menstrual history, contraceptive errors, medications, and interest in ongoing contraception; these details determine which emergency contraception (EC) option fits. [\[3\]](#cite-3 "Reference [3]") The second clock is ovulation. Oral EC works by delaying ovulation, whereas copper impairs sperm function and fertilization; neither approach terminates an established pregnancy. Don’t confuse a five-day treatment window with reliable oral efficacy after ovulation. [\[4\]](#cite-4 "Reference [4]") OptionPractical timingMain advantageCopper IUDWithin five days of the first unprotected act; an ovulation-based exception existsHighest efficacy and ongoing contraceptionLevonorgestrel, 1.5 mg orally onceASAP; strongest early, with declining efficacy laterOver-the-counter accessUlipristal acetate, 30 mg orally onceASAP within 120 hoursMore effective oral option on days 3–5 These timing and dosing distinctions—not the phrase “morning-after”—should guide counseling. [\[1\]](#cite-1 "Reference [1]") Copper IUD: Offer the Most Effective Option ------------------------------------------- A copper IUD placed within 120 hours is **more than 99% effective** as EC. Copper interferes with sperm movement and fertilization rather than suppressing ovulation, making it particularly valuable when ovulation may already have occurred. [\[5\]](#cite-5 "Reference [5]") ### Apply the Timing Exception Correctly CDC permits placement more than five days after intercourse when ovulation can be estimated, provided insertion occurs no more than five days after ovulation. This is not permission to insert at any point after a negative urine pregnancy test: recent conception may not yet be detectable. [\[1\]](#cite-1 "Reference [1]") Before insertion: - Assess pregnancy risk and standard IUD eligibility. - Do not insert with current purulent cervicitis or known gonorrhea/chlamydia infection. - Perform indicated STI screening the same day; awaiting results alone should not delay placement in an otherwise eligible patient. - Explain that heavier bleeding and cramping may occur; no backup contraception is needed after copper IUD placement. [\[6\]](#cite-6 "Reference [6]") Offer the device without pressure. Its combination of emergency and ongoing contraception is an advantage only if it matches the patient’s preferences. [\[2\]](#cite-2 "Reference [2]") Oral EC: Similar Goal, Different Limitations -------------------------------------------- ### Levonorgestrel: Earlier Is Better Give levonorgestrel (LNG) 1.5 mg as a single oral dose. U.S. labeling specifies use within 72 hours, and its nonprescription availability can make treatment immediately accessible. It works before egg release—not by disrupting implantation. [\[7\]](#cite-7 "Reference [7]") CDC allows EC pills within five days, but LNG effectiveness declines with delay, especially on days 4–5. Prefer ulipristal or copper IUD at later presentation; do not interpret the 72-hour label as a reason to deny all EC afterward. [\[1\]](#cite-1 "Reference [1]") ### Ulipristal: Better Near Ovulation, Not After It Ulipristal acetate (UPA) is a selective progesterone-receptor modulator. Unlike LNG, it can delay follicular rupture after the LH surge begins but before the LH peak; neither oral agent has demonstrated reliable efficacy after ovulation. [\[3\]](#cite-3 "Reference [3]") UPA requires a prescription in the United States. Arrange prompt access rather than letting the prescription become a treatment delay. [\[8\]](#cite-8 "Reference [8]") > **Clinical Pearl:** UPA’s advantage is a later preovulatory opportunity—not a postovulatory rescue effect. [\[3\]](#cite-3 "Reference [3]") ### Let Patient Factors Refine the Choice - Higher weight/BMI may reduce oral EC effectiveness, particularly LNG; copper IUD efficacy is not reduced by weight. Avoid presenting a single weight cutoff as proof that pills cannot work. [\[8\]](#cite-8 "Reference [8]") - Enzyme-inducing medications can reduce oral EC effectiveness. Favor copper IUD when suitable and review drug interactions rather than improvising dosing. [\[9\]](#cite-9 "Reference [9]") A current-practice nuance: Society of Family Planning also recognizes the 52-mg LNG IUD as EC. CDC’s 2024 EC section lists copper as its intrauterine option; don’t generalize LNG-IUD evidence to lower-dose devices. [\[10\]](#cite-10 "Reference [10]") The Restart Plan Is Part of Treatment ------------------------------------- The common avoidable error is giving UPA and immediately restarting a progestin-containing contraceptive. Progestin exposure can undermine UPA’s ovulation-delaying action. [\[2\]](#cite-2 "Reference [2]") 1. **After LNG:** Start or resume regular contraception immediately; use condoms or abstain for seven days. 2. **After UPA:** Wait five full days before starting hormonal contraception. Use condoms or abstain during the wait and for seven days after starting, or until the next menses, whichever occurs first. 3. **After either pill:** Advise pregnancy testing if no withdrawal bleed occurs within three weeks. [\[2\]](#cite-2 "Reference [2]") Oral EC does not provide ongoing protection against subsequent intercourse. Also address STI prevention separately: EC does not prevent infection. [\[8\]](#cite-8 "Reference [8]") Key Takeaways ------------- - Offer copper IUD for maximal efficacy and immediate ongoing protection. [\[4\]](#cite-4 "Reference [4]") - Use LNG promptly; remember its labeled 72-hour window differs from broader guideline timing. [\[7\]](#cite-7 "Reference [7]") - Choose UPA over LNG for late oral presentation, and delay hormonal restart afterward. [\[2\]](#cite-2 "Reference [2]") For the patient presenting at 96 hours, discuss copper IUD first without coercion, then UPA if an oral method is preferred. Finish with a clear restart and testing plan—not merely a prescription. [\[4\]](#cite-4 "Reference [4]") Frequently Asked Questions ---------------------------- ### Does emergency contraception cause abortion? No. EC prevents pregnancy; it does not interrupt an established pregnancy. [\[4\]](#cite-4 "Reference [4]") ### Can a nulliparous adolescent receive a copper IUD for EC? Yes. Adolescence and nulliparity do not preclude IUD use; assess standard eligibility and patient preferences. [\[6\]](#cite-6 "Reference [6]") ### What if the patient vomits after an EC pill? CDC recommends another dose as soon as possible if vomiting occurs within three hours; consider an antiemetic. [\[1\]](#cite-1 "Reference [1]") References (10) ------------------- 1. 1. [ CDC. Emergency Contraception. U.S. SPR, 2024. ](https://www.cdc.gov/contraception/hcp/usspr/emergency-contraception.html) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ www.cdc.gov/mmwr/volumes/73/rr/rr7303a1.htm ](https://www.cdc.gov/mmwr/volumes/73/rr/rr7303a1.htm) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ societyfp.org/wp-content/uploads/2023/05/SFP-Clinical-Recommendation\_Emergency-contraception-2023\_Final.pdf ](https://societyfp.org/wp-content/uploads/2023/05/SFP-Clinical-Recommendation_Emergency-contraception-2023_Final.pdf) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ www.who.int/news-room/fact-sheets/detail/emergency-contraception ](https://www.who.int/news-room/fact-sheets/detail/emergency-contraception) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ www.who.int/news-room/fact-sheets/detail/intrauterine-devices ](https://www.who.int/news-room/fact-sheets/detail/intrauterine-devices) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ www.cdc.gov/contraception/hcp/usspr/intrauterine-contraception.html ](https://www.cdc.gov/contraception/hcp/usspr/intrauterine-contraception.html) [↩](#cite-ref-6-1 "Back to text") 7. 7. [ FDA. Plan B One-Step Information. ](https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/plan-b-one-step-15-mg-levonorgestrel-information) [↩](#cite-ref-7-1 "Back to text") 8. 8. [ www.acog.org/womens-health/faqs/emergency-contraception ](https://www.acog.org/womens-health/faqs/emergency-contraception) [↩](#cite-ref-8-1 "Back to text") 9. 9. [ www.cdc.gov/mmwr/volumes/73/rr/rr7304a1\_appendix.htm ](https://www.cdc.gov/mmwr/volumes/73/rr/rr7304a1_appendix.htm) [↩](#cite-ref-9-1 "Back to text") 10. 10. [ Society of Family Planning. Emergency contraception. 2023; reaffirmed April 2026. ](https://societyfp.org/clinical_guidances/society-of-family-planning-clinical-recommendation-emergency-contraception/) [↩](#cite-ref-10-1 "Back to text") Next Build confidence in OB/GYN with focused practice -------------------------------------------------- - Labor & delivery + postpartum essentials - Gynecology, screening, and common procedures - Review weak topics and improve faster [ Start practicing ](https://mdster.com/user/dashboard) [ Obstetrics & Gynecology ](https://mdster.com/speciality/obstetrics-gynecology) [ View pricing ](https://mdster.com/pricing) [ Explore features ](https://mdster.com/features) No credit card required. Full access to all features\*. No commitment. 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