Pregnancy Chances After Protected Intercourse: Key Insights

Pregnancy probability

Hello doctor, I would like to ask about an encounter I had today, October 24th, with my girlfriend.
Her last menstrual period was on October 11th, and her cycle is approximately 28-35 days.
We used a condom throughout the entire duration of intercourse, starting from erection.
After a while, I became a bit tired, and when I pulled out, I found that I could not reinsert.
Later, I checked the condom by filling it with water, and it did not break.
Doctor, what is the likelihood of pregnancy in this situation?

Niming, 20~29 year old female. Ask Date: 2019/10/24

Dr. Huang Jianzhong reply Obstetrics and Gynecology

On October 24, I had sexual intercourse with my girlfriend.
Her last period started on October 11, and her cycle is approximately 28-35 days.
We used a condom from the beginning of the erection until it became soft due to fatigue, at which point I withdrew and found that re-insertion was not possible, so we stopped.
Later, I checked the condom by filling it with water, and it did not break.
Doctor, what is the likelihood of pregnancy in this situation? Answer: The likelihood of pregnancy is low.

Reply Date: 2019/10/24

More Info

When considering the chances of pregnancy after protected intercourse, several factors come into play, including the timing of the menstrual cycle, the effectiveness of the contraceptive method used, and the nature of the sexual activity. In your case, you mentioned that you had sexual intercourse with your girlfriend on October 24, and her last menstrual period started on October 11, with a cycle length of approximately 28-35 days.

First, let's analyze the timing of the menstrual cycle. A typical menstrual cycle lasts about 28 days, but it can vary significantly from person to person. Ovulation typically occurs around 14 days before the start of the next menstrual period. Given that your girlfriend's last period started on October 11, she would likely ovulate around October 25, assuming a 28-day cycle. If her cycle is longer, ovulation could occur later. Since you had intercourse on October 24, this timing is very close to her expected ovulation date, which can increase the chances of pregnancy.

However, you mentioned that you used a condom throughout the intercourse and that it was intact upon inspection. Condoms are highly effective at preventing pregnancy when used correctly, with a typical use failure rate of about 13% and a perfect use failure rate of about 2%. Since you confirmed that the condom did not break, the likelihood of pregnancy is significantly reduced.

In addition to the use of condoms, it’s important to consider other factors that can affect pregnancy risk. For instance, pre-ejaculate fluid (pre-cum) can contain sperm, but the risk of pregnancy from pre-ejaculate is generally low, especially if a condom is used properly. Since you indicated that the condom was intact and there was no spillage, this further decreases the chances of pregnancy.

Regarding your concern about the possibility of pregnancy, based on the information provided, the chances are relatively low, especially since you used a condom effectively. However, it is essential to remember that no contraceptive method is 100% effective, and there is always a small risk of pregnancy with any sexual activity.

If your girlfriend's menstrual cycle is regular, you can expect her next period to arrive around November 8, assuming a 28-day cycle. If her cycle is longer, it may arrive later. If her period is late by a week or more, it would be advisable for her to take a home pregnancy test for confirmation.

In summary, while the timing of your intercourse was close to her ovulation date, the use of a condom that did not break significantly reduces the chances of pregnancy. If you have any further concerns or if your girlfriend experiences any unusual symptoms, it may be beneficial to consult a healthcare provider for personalized advice and guidance.

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