Can You Get Pregnant After Taking Emergency Contraceptive? - Obstetrics and Gynecology

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Taking emergency contraception after sexual intercourse one day before menstruation?


I took emergency contraception, had sexual intercourse about a week later, and there was ejaculation inside me.
However, my period started the next morning.
Is it possible that I could be pregnant? Does this resemble a normal menstrual period, and does it indicate that I am in a safe period?

A, 20~29 year old female. Ask Date: 2017/02/25

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, emergency contraceptive pills can sometimes cause irregular menstruation.
If your period arrives, the chances of pregnancy are low.
It is best to use preventive measures beforehand.
Wishing you good health.

Reply Date: 2017/02/25

More Info


When it comes to emergency contraception, it's important to understand how it works and its effectiveness. Emergency contraceptive pills (ECPs), often referred to as "morning-after pills," are designed to prevent pregnancy after unprotected intercourse or contraceptive failure. They work primarily by delaying ovulation, preventing fertilization, or inhibiting implantation of a fertilized egg.
In your case, you mentioned that you took the emergency contraceptive pill and then had unprotected intercourse about a week later, during which ejaculation occurred inside you. Following that, you experienced what you described as a menstrual period the next morning. This raises a few important points to consider regarding the likelihood of pregnancy.

1. Timing of the Menstrual Cycle: If you had your period after taking the emergency contraceptive, it is generally a good sign that you are not pregnant. The onset of menstruation typically indicates that ovulation did not occur, and thus, the chances of pregnancy are significantly reduced. However, it's essential to note that ECPs can cause changes in your menstrual cycle, including earlier or later periods, heavier or lighter bleeding, and even spotting.

2. Effectiveness of Emergency Contraceptives: ECPs are most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours, but some types can be effective up to 5 days after. If you took the pill within this timeframe, it would have a high chance of preventing pregnancy. However, if you had unprotected intercourse after taking the pill, there is still a risk of pregnancy, as the ECP may not be effective against sperm that are already present.

3. Understanding Safe Periods: The concept of a "safe period" refers to the days in a woman's menstrual cycle when she is least likely to conceive. However, this method is not entirely reliable, as cycles can vary significantly from month to month, and ovulation can occur earlier or later than expected. Therefore, relying solely on the timing of your menstrual cycle for contraception can lead to unintended pregnancies.

4. Next Steps: If you are concerned about the possibility of being pregnant despite having your period, the best course of action is to take a home pregnancy test about a week after your expected period date. If the test is positive or if you have any symptoms of pregnancy, it would be wise to consult with a healthcare provider for further evaluation.

5. Impact of Alcohol Consumption: You also mentioned drinking alcohol after the potential conception date. While moderate alcohol consumption during early pregnancy is a topic of ongoing research, it is generally advised to avoid alcohol altogether during pregnancy, as it can lead to fetal alcohol spectrum disorders (FASDs) and other complications. If you are confirmed to be pregnant, it is crucial to discuss any alcohol consumption with your healthcare provider.

In conclusion, while taking emergency contraception significantly reduces the risk of pregnancy, it is not 100% effective, especially if unprotected intercourse occurs after taking the pill. The appearance of your period is a positive sign, but if you have any doubts or concerns, taking a pregnancy test and consulting with a healthcare professional is the best way to ensure your reproductive health.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, the chances of pregnancy are low, and you shouldn't rely on the safe period. It's better to take preventive measures before engaging in sexual activity. If your period is more than a week late, it's advisable to see a gynecologist. Wishing you good health.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, taking emergency contraception will prevent pregnancy. Wishing you good health.

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On August 25, menstruation just ended, and on August 28, unprotected intercourse occurred after menstruation. The emergency contraceptive pill was taken afterward. Is there a possibility of pregnancy in this situation?


Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, the chances of pregnancy are low, but it is best to take preventive measures beforehand. Do not rely on the safe period. If your period is more than a week late, it is advisable to see a gynecologist. Wishing you good health.

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