Pregnancy Chances: What to Know After Unprotected Intercourse

Pregnancy probability

My menstrual cycle is usually 21 days, and it sometimes gets delayed by one or two days.
My last period was from June 26 to July 2, and I had sexual intercourse on July 9 (the app indicated a high chance of conception that day).
However, I used a condom, and while penetration occurred, I'm not sure if the condom broke.
I withdrew before ejaculation.
My period is normally expected on July 22, but it hasn't arrived yet.
Could this mean I am pregnant? What is the likelihood of pregnancy?

Han, 10~19 year old female. Ask Date: 2017/07/26

Dr. Huang Jianzhong reply Obstetrics and Gynecology

Menstruation typically occurs every 21 days, but it can sometimes be delayed by one or two days.
My last period was from June 26 to July 2, and I had sexual intercourse on July 9 (the app indicated a high chance of conception that day).
However, we used a condom, and while penetration occurred, I am unsure if the condom broke.
I withdrew before ejaculation.
My period is normally expected on July 22, but it has not arrived yet.
Could I be pregnant? Is the likelihood of pregnancy high? Answer: Since intercourse was protected with a condom, and I am unsure if it broke, along with the fact that I withdrew before ejaculation, the likelihood of pregnancy is generally low.
I suggest taking a pregnancy test on July 29.

Reply Date: 2017/07/26

More Info

When it comes to understanding the chances of pregnancy after unprotected intercourse, there are several factors to consider. Based on your menstrual cycle, which typically lasts around 21 days, ovulation likely occurs around the middle of your cycle. Given that your last menstrual period was from June 26 to July 2, ovulation would typically occur around July 10, which is very close to the date of your sexual encounter on July 9. This timing could suggest a higher likelihood of pregnancy, especially if there was any chance that the condom broke or if there was any pre-ejaculate fluid present.

However, you mentioned that you used a condom and withdrew before ejaculation, which significantly reduces the risk of pregnancy. Condoms are generally effective at preventing pregnancy when used correctly, with a failure rate of about 2% with perfect use and about 18% with typical use. If the condom did not break and was used properly, the chances of pregnancy would be low.

The fact that your period is late can be concerning, but it is important to note that menstrual cycles can vary for many reasons, including stress, hormonal changes, or other health factors. Since your cycle is usually 21 days, a delay of a few days can happen, but if your period does not arrive soon, it would be wise to take a home pregnancy test. These tests are designed to detect the hormone hCG (human chorionic gonadotropin), which is produced during pregnancy.
If the test is positive, it would indicate that you are pregnant, and you should follow up with a healthcare provider for further evaluation and prenatal care. If the test is negative and your period still does not arrive, it might be a good idea to consult with a healthcare professional to explore other potential reasons for the delay.

In summary, while the timing of your sexual encounter does suggest a possibility of pregnancy, the use of a condom and withdrawal method significantly lowers that risk. If you are concerned about the possibility of being pregnant, taking a home pregnancy test would be the next best step. If you have further questions or concerns, especially if your period continues to be delayed, seeking advice from a healthcare provider would be beneficial. They can provide more personalized insights based on your health history and current situation.

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