Can Postinor 2 Prevent Pregnancy After Unprotected Sex?

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I had intercourse with my boyfriend a week before my period, and he ejaculated outside.
Afterwards, I took Postinor 2.
My period was delayed by 9 days and has now arrived.
Is there still a chance of pregnancy?

Zheng Nüshi, 20~29 year old female. Ask Date: 2016/01/09

Dr. Lin Manying reply Obstetrics and Gynecology

Hello, if there are any abnormalities in menstrual flow, it is advisable to take a pregnancy test.

Reply Date: 2016/01/09

More Info

Postinor 2, which contains the active ingredient Levonorgestrel, is an emergency contraceptive pill designed to prevent pregnancy after unprotected sexual intercourse or contraceptive failure, such as a broken condom. It is most effective when taken as soon as possible after the incident, ideally within 72 hours, but it can still be taken up to 120 hours (5 days) after unprotected sex, although its effectiveness decreases over time.

In your case, since you took Postinor 2 after unprotected intercourse, it is likely that the pill has worked to prevent pregnancy. The fact that your menstrual period arrived 9 days late but eventually came is a positive sign. Emergency contraceptive pills can cause changes in your menstrual cycle, including delays, earlier onset, or changes in flow. This is due to the hormonal effects of the medication on your body, which can temporarily disrupt your normal menstrual cycle.

It's important to note that while Postinor 2 is effective, it is not 100% guaranteed to prevent pregnancy. The effectiveness of the pill is approximately 85% when taken within the recommended time frame. If your period has started, it is a strong indication that you are not pregnant. However, if your period was significantly different from your usual cycle (e.g., very light or very heavy), or if you experience any unusual symptoms, it may be wise to take a pregnancy test for peace of mind.

Additionally, if you have concerns about your menstrual cycle or the possibility of pregnancy, it is always a good idea to consult with a healthcare provider. They can provide personalized advice and may recommend a pregnancy test if you have any doubts.

In summary, Postinor 2 is designed to prevent pregnancy after unprotected sex, and while it is effective, it is not infallible. The arrival of your period, even if it was delayed, is a reassuring sign. If you have any lingering concerns or experience unusual symptoms, seeking medical advice is the best course of action.

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