Am I Pregnant? Menstrual Changes After Unprotected Sex - Obstetrics and Gynecology

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Are you pregnant?


Hello doctor, on March 28th, I had unprotected intercourse and withdrew after a few thrusts.
I took the emergency contraceptive pill on the afternoon of March 30th.
My period started on April 7th, but the flow was slightly lighter than usual.
I also had my period in May, around the 3rd or 4th, and it was a normal flow.
However, I haven't gotten my period in June yet.
I've been staying up late, usually going to bed around 2 or 3 AM.
Am I pregnant, or is it just due to stress or staying up late that my period is delayed?

Niming, 10~19 year old female. Ask Date: 2020/06/06

Dr. Wu Xianghui reply Obstetrics and Gynecology


For pregnancy concerns, please take a home pregnancy test or consult a gynecologist for evaluation four weeks after sexual intercourse.

Reply Date: 2020/06/06

More Info


Based on the information you've provided, it seems that you are concerned about the possibility of being pregnant after having unprotected sex on March 28, taking emergency contraception on March 30, and experiencing changes in your menstrual cycle thereafter. Let's break down your situation and address your concerns.

1. Understanding Emergency Contraception: Emergency contraception (EC), such as the pill you took, is designed to prevent pregnancy after unprotected intercourse. It is most effective when taken as soon as possible after the incident, ideally within 72 hours. Since you took the EC within this timeframe, it significantly reduces the likelihood of pregnancy. However, it is important to note that EC can cause temporary changes in your menstrual cycle.

2. Menstrual Changes After Taking EC: After taking emergency contraception, it is common for women to experience changes in their menstrual cycle. This can include lighter or heavier periods, changes in the timing of your period, or even missed periods. The hormonal content in EC can disrupt your normal cycle, leading to variations in flow and timing. You mentioned that your period in April was lighter than usual, which can be a side effect of the EC.

3. Missed Period in June: You noted that you have not had your period in June. While this could be a sign of pregnancy, it is also possible that the emergency contraception has caused a delay in your menstrual cycle. Stress, anxiety, and lifestyle factors such as lack of sleep can also contribute to missed or delayed periods. Given that you mentioned staying up late and possibly experiencing stress, these factors could be influencing your cycle as well.

4. Pregnancy Testing: If you are concerned about the possibility of being pregnant, the most reliable way to confirm or rule out pregnancy is to take a home pregnancy test. These tests are designed to detect the hormone hCG, which is produced during pregnancy. It is recommended to take the test at least one week after your missed period for the most accurate result. If the test is positive, you should follow up with a healthcare provider for further evaluation.

5. Consulting a Healthcare Provider: If your period does not return or if you have any other concerning symptoms (such as severe abdominal pain, unusual discharge, or persistent nausea), it is advisable to consult a healthcare provider. They can perform a blood test for pregnancy and assess your overall reproductive health.

In summary, while the likelihood of pregnancy is reduced due to the timely use of emergency contraception, changes in your menstrual cycle can occur as a result of hormonal fluctuations. If you are still concerned about the possibility of being pregnant, taking a home pregnancy test and consulting with a healthcare provider would be the best course of action. Remember that stress and lifestyle factors can also play a significant role in your menstrual health, so it’s important to take care of your overall well-being.

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