Pregnancy Chances After Protected Intercourse

Pregnancy probability

My last menstrual period was from November 28 to December 5.
I had sexual intercourse with my boyfriend on December 16, and we used a condom (which was kept in my wallet).
Afterward, I checked and it did not break.
However, today is December 31 and my period has not arrived yet.
What are the chances of being pregnant?

Suonian, 20~29 year old female. Ask Date: 2023/12/31

Dr. Zhang Kunmin reply Obstetrics and Gynecology

Hello, the failure rate of using condoms for contraception is over 5%, which is less reliable compared to other methods.
It is recommended to check for pregnancy if your menstrual period is more than a week late.
Thank you! Wishing you safety and health.
Dr.
Chang

Reply Date: 2023/12/31

More Info

When it comes to understanding the chances of pregnancy after protected intercourse, it's essential to consider several factors, including the timing of ovulation, the effectiveness of the contraceptive method used, and individual variations in menstrual cycles.

In your case, you mentioned that your last menstrual period started on November 28 and lasted until December 5. Assuming you have a regular cycle, ovulation typically occurs about 14 days before your next period. If your cycle is around 28 days, you would likely ovulate around December 12. Since you had intercourse on December 16, this would be after your estimated ovulation date, which generally reduces the likelihood of pregnancy.
Using condoms is an effective method of contraception when used correctly. According to studies, condoms have a failure rate of about 2% with perfect use and about 18% with typical use. Since you confirmed that the condom did not break during intercourse, the chances of pregnancy remain low. However, no contraceptive method is 100% effective, and there is always a small risk of pregnancy with any sexual activity.

Given that your period is late, it could be due to several reasons other than pregnancy. Stress, hormonal imbalances, changes in weight, or even illness can cause menstrual irregularities. If your period does not arrive within a week or so, it would be advisable to take a home pregnancy test for confirmation. These tests are designed to detect the hormone hCG (human chorionic gonadotropin), which is produced during pregnancy, and they are most accurate when taken after a missed period.

If the test is negative and your period still does not come, it may be wise to consult with a healthcare provider. They can help determine the cause of your missed period and provide guidance on your reproductive health.

In summary, while the chances of pregnancy after protected intercourse are low, especially given the timing in relation to your ovulation, it is still possible. If you are concerned about your missed period, taking a pregnancy test and consulting with a healthcare professional can provide clarity and peace of mind.

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