Request an Appointment at Mayo Clinic. Share on: Facebook Twitter. Show references Kaunitz AM. Emergency contraception. Accessed March 29, Frequently asked questions. Contraception FAQ American College of Obstetricians and Gynecologists. Accessed March, 29, Ella prescribing information. Parsippany, N. Related Plan B One-Step. Morning-after pill About. Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic.
Research, however, shows that Plan B does not work this way. Instead, it works by preventing ovulation and fertilization of the egg. Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life.
Obstetrician-gynecologists' beliefs about when pregnancy begins. Am J Obstet Gynecol. Department of Health and Human Services. Reviewed March 10, Emergency contraception — mechanisms of action. Effectiveness of levonorgestrel emergency contraception given before or after ovulation — a pilot study.
Effect of single post-ovulatory administration of levonorgestrel on gene expression profile during the receptive period of the human endometrium. J Mol Endocrinol. Food and Drug Administration. Published July 20, Plan B 0. Updated May 19, Your Privacy Rights. To change or withdraw your consent choices for VerywellHealth.
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We and our partners process data to: Actively scan device characteristics for identification. I Accept Show Purposes. Table of Contents View All. Table of Contents. What the Research Says. The Controversy. The Controversy Today. Was this page helpful? Thanks for your feedback! Sign Up. Examples of such medicines and herbal products include:. The only way to know if Plan B has prevented pregnancy is to wait for your next period. If your period arrives more than a week late, you may want to consider taking a pregnancy test.
Talking with your healthcare provider is the best way to learn about family planning methods that will work best for you. After this amount of time, the hormones that were in the pill will have left the body. The maximum amount of time that it stays in the body coincides with the amount of time that sperm can live inside the female reproductive tract—about five to six days. A long-term form of birth control is the best way to prevent pregnancy.
Long-term birth control options include the birth control pill, IUDs, implants, shots, patches, latex condoms, and vaginal rings if used every time you have sex. Adults can buy Plan B One-Step over-the-counter without a prescription at most drugstores and pharmacies. You can also get it from family planning centers or health department clinics. Most insurance companies will cover the cost if a healthcare provider prescribes it as an emergency contraceptive.
SingleCare offers discounts on other forms of birth control, too. Learn how to find free birth control without health insurance here.
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