Can Emergency Contraceptive Pills Prevent Pregnancy After Condom Failure? - Obstetrics and Gynecology

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Birth control pill issues?


Hello doctor, my period started on the 16th and ended on the 20th.
I had intercourse with my boyfriend, but the condom accidentally broke, and he ejaculated inside me.
I took the emergency contraceptive pill, Plan B, one hour later.
Is there a chance I could be pregnant?

An, 20~29 year old female. Ask Date: 2020/01/20

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, the chances of pregnancy should be low.
Wishing you good health.

Reply Date: 2020/01/20

More Info


Emergency contraceptive pills (ECPs), such as Plan B or similar medications, are designed to prevent pregnancy after unprotected intercourse or contraceptive failure, such as a broken condom. In your case, since you took the emergency contraceptive pill within one hour of the condom breaking and ejaculation occurring, you have taken a proactive step to reduce the risk of pregnancy.

ECPs work primarily by delaying or inhibiting ovulation. If taken before ovulation occurs, they can prevent the release of an egg from the ovary. If ovulation has already occurred, ECPs may not be effective. However, since you took the pill shortly after the incident, it is likely that it will be effective in preventing pregnancy.

It is important to note that ECPs are most effective when taken as soon as possible after unprotected intercourse. They can be taken up to 72 hours after the event, but their efficacy decreases the longer you wait. In some cases, certain types of ECPs can be effective up to 5 days after unprotected sex, but the sooner you take them, the better.

In addition to preventing ovulation, ECPs may also work by altering the uterine lining, making it less suitable for implantation if fertilization has already occurred. However, it is crucial to understand that ECPs do not terminate an existing pregnancy and are not the same as abortion pills.

Regarding your concern about the possibility of pregnancy, if you took the emergency contraceptive pill as directed, your chances of becoming pregnant are significantly reduced. However, no contraceptive method is 100% effective, and there is still a small risk of pregnancy. If your next menstrual period is delayed by more than a week, it is advisable to take a pregnancy test to confirm whether or not you are pregnant.

In the meantime, it is essential to monitor your menstrual cycle and be aware of any unusual symptoms. If you experience any significant changes or have concerns, it is always a good idea to consult with a healthcare provider. They can provide personalized advice and support based on your specific situation.

Lastly, consider discussing long-term contraceptive options with your healthcare provider to prevent similar situations in the future. There are various methods available, including hormonal birth control, intrauterine devices (IUDs), and barrier methods, each with its own benefits and considerations.

In summary, taking the emergency contraceptive pill shortly after a condom failure significantly reduces the risk of pregnancy. While it is not guaranteed, it is a responsible choice that can help you manage your reproductive health effectively. If you have further questions or concerns, do not hesitate to reach out to a healthcare professional for guidance.

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