Do You Need Emergency Contraception After Intercourse Post-Pill?

Emergency contraceptive pill

Hello, I took the emergency contraceptive pill on September 24.
If I have unprotected intercourse a few days later, do I need to take the emergency contraceptive pill again? If I don't take it, what is the likelihood of becoming pregnant? My last menstrual period started on September 9.
Thank you, doctor!

Niming, 20~29 year old female. Ask Date: 2015/09/27

Dr. Lü Lizheng reply Obstetrics and Gynecology

Taking emergency contraception can alter the endometrium, making it less conducive for embryo implantation.
This effect can persist, so there is no need to take additional medication temporarily.
However, emergency contraception is only about 80% effective, so if menstruation does not occur afterward, it is still necessary to take a pregnancy test for confirmation.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/09/27

More Info

After taking emergency contraception (the "morning-after pill") on September 24, if you have unprotected intercourse again shortly after, you may indeed need to consider taking emergency contraception again. The effectiveness of emergency contraception diminishes over time, and it is designed to prevent pregnancy after unprotected sex or contraceptive failure.
Emergency contraception works primarily by delaying ovulation. If you have already ovulated, taking the pill may not be effective. Since you mentioned that your last menstrual period started on September 9, it is possible that you were approaching ovulation around the time of your unprotected intercourse, especially if you have a regular cycle.
The likelihood of becoming pregnant after unprotected intercourse depends on several factors, including the timing of your cycle, whether you have already ovulated, and how soon after intercourse you take the emergency contraception. If you had unprotected sex after taking the emergency contraception, the risk of pregnancy increases, especially if you are within your fertile window.

If you choose not to take emergency contraception after the second instance of unprotected intercourse, the risk of pregnancy can be significant, particularly if you are close to ovulation. The general advice is that if you have unprotected sex after taking the emergency contraception, you should take another dose as soon as possible, ideally within 72 hours, but some types can be effective up to 5 days after intercourse.

It is also important to consider that emergency contraception is not intended to be used as a regular form of birth control. If you find yourself needing emergency contraception frequently, it may be beneficial to discuss long-term contraceptive options with your healthcare provider.
In summary, if you had unprotected intercourse after taking the emergency contraception, it is advisable to take another dose of the emergency contraception as soon as possible to reduce the risk of pregnancy. If you have any concerns about your menstrual cycle or potential pregnancy, it is also a good idea to consult with a healthcare provider for personalized advice and guidance.

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