Impact of Emergency Contraceptive Pills on Pregnancy Outcomes - Obstetrics and Gynecology

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The likelihood of pregnancy after taking emergency contraceptive pills (ECPs) is low, but if pregnancy does occur, studies suggest that the use of ECPs does not significantly increase the risk of adverse effects on the fetus. However, it is always recommended to consult with a healthcare provider for personalized advice and to discuss any concerns regarding pregnancy and medication use?


Hello Doctor: My last menstrual period started on October 5 and ended on October 11, and my menstrual cycle is very regular.
I had unprotected sexual intercourse on October 18 and October 20.
On October 21, I took the emergency contraceptive pill, Levonorgestrel 1.5 mg, but I still became pregnant within the 72-hour window.
I would like to ask if this will have any impact on the fetus? Can I keep this child?

Fei, 20~29 year old female. Ask Date: 2013/11/15

Dr. Liu Yuhong reply Obstetrics and Gynecology


There will be no impact on the fetus! Based on the information you provided, it is inferred that the fertilized egg has not yet implanted in the uterus at the time of taking the emergency contraceptive pill.

Reply Date: 2013/11/15

More Info


The use of emergency contraceptive pills (ECPs), such as Levonorgestrel (commonly known as Plan B), is a topic of significant interest and concern for many women who find themselves in situations where they may have had unprotected intercourse. In your case, you took Levonorgestrel within the recommended time frame after unprotected intercourse, which is designed to prevent pregnancy. However, it appears that you are now pregnant despite taking the medication.

First and foremost, it's important to clarify how ECPs work. Levonorgestrel primarily functions by preventing ovulation; if ovulation has already occurred, it may not be effective. It does not terminate an existing pregnancy. Therefore, if you are already pregnant at the time of taking the pill, it will not have any effect on the pregnancy itself.

Regarding the potential impact of Levonorgestrel on fetal development, research indicates that there is no evidence to suggest that taking ECPs during early pregnancy poses a risk to the developing fetus. The available studies have shown that the use of Levonorgestrel does not lead to an increased risk of congenital anomalies or other adverse pregnancy outcomes. The FDA has classified Levonorgestrel as a Category X medication when used for contraception, meaning it is not recommended for use during pregnancy. However, this classification is based on its intended use as a contraceptive rather than its effects on an established pregnancy.

Given that you are now pregnant, the most important step is to consult with your healthcare provider or obstetrician. They can provide you with personalized advice and monitor your pregnancy closely. It's essential to ensure that you receive appropriate prenatal care, which includes regular check-ups, ultrasounds, and any necessary screenings to ensure the health of both you and your baby.

In terms of your concerns about the viability of the pregnancy, it is crucial to understand that many women have successfully carried pregnancies to term after taking ECPs. The decision to continue with the pregnancy is ultimately yours, and it should be made based on your personal circumstances, health considerations, and discussions with your healthcare provider.

If you have any additional concerns about your pregnancy or the effects of medications you may have taken, do not hesitate to reach out to your healthcare provider. They can offer reassurance and guidance tailored to your specific situation. Remember, early prenatal care is vital for a healthy pregnancy, so scheduling an appointment as soon as possible is advisable.

In summary, taking Levonorgestrel after unprotected intercourse does not harm an existing pregnancy, and there is no evidence to suggest that it will negatively impact fetal development. Your healthcare provider is your best resource for navigating this situation and ensuring a healthy pregnancy moving forward.

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