Pregnancy Chances After Unprotected Intercourse: A Guide

What is the probability of getting pregnant?

Hello, doctor.
My partner and I attempted penetration on March 9, but it was unsuccessful; the tip entered and there was some friction at the opening (we used a condom the entire time, and it was our first time).
On March 14 and March 15, we had intercourse with two condoms each time.
The male partner correctly wore the condom and withdrew before ejaculation (the condom remained on from foreplay to the end, and we immediately rinsed it after finishing; it did not break).
My menstrual period was expected on March 18, but it is now five days late.
My ovulation period was from February 27 to March 5.
What are the chances of pregnancy? My cycle is typically around 32 to 35 days.
My last period ended on November 10, 2022, and I did not have another until January 10, 2023 (due to stress).
My period ended on January 14, 2023, and I had another on February 11 (32-day cycle).
Thank you for your help.

Niming, 10~19 year old female. Ask Date: 2023/03/24

Dr. Zhang Kunmin reply Obstetrics and Gynecology

Hello, based on your description, there is a possibility of pregnancy, as the failure rate of correctly using condoms is still around 5%.
I recommend that if your period is a week late, you should take a urine test to check for pregnancy.
Thank you! Wishing you peace and health.
Dr.
Chang

Reply Date: 2023/03/24

More Info

When it comes to understanding the chances of pregnancy after unprotected intercourse, several factors come into play, including the timing of intercourse in relation to ovulation, the reliability of contraceptive methods used, and individual variations in menstrual cycles.

In your case, you mentioned having unprotected intercourse on March 9, with your expected period on March 18. Given that your menstrual cycle averages between 32 to 35 days, ovulation likely occurred around February 27 to March 5. Since sperm can survive in the female reproductive tract for up to five days, if you had intercourse during your fertile window, there is a possibility of pregnancy.

However, you also noted that during your attempts, you used condoms correctly, and there were no reported breakages. Condoms are a reliable form of contraception when used properly, with a typical effectiveness rate of about 85% to 98% in preventing pregnancy. If the condoms did not break and were used throughout the sexual activity, the chances of pregnancy are significantly reduced.

The delay in your menstrual cycle could be attributed to various factors, including stress, hormonal fluctuations, or changes in your routine. Stress, in particular, can impact the menstrual cycle, leading to delayed periods. Given that you experienced a significant delay in your cycle previously due to stress, it is possible that this could be a contributing factor again.

If your period does not arrive within a week of its expected date, it would be advisable to take a home pregnancy test for a more definitive answer. These tests are designed to detect the hormone hCG (human chorionic gonadotropin), which is produced during pregnancy. If the test is negative and your period still does not come, consider consulting a healthcare provider for further evaluation.

In summary, while the chances of pregnancy exist if intercourse occurred during your fertile window, the use of condoms significantly lowers that risk. If you are experiencing a delayed period, it may be related to stress or other factors rather than pregnancy. Monitoring your cycle and taking a pregnancy test if your period does not arrive soon will provide clarity on your situation. If you have further concerns or questions, seeking advice from a healthcare professional can also be beneficial.

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