the Risks of Unprotected Sex During Fertility Windows

Risky sexual behavior

My girlfriend's last menstrual period was late by a week, from March 28 to April 2.
We had sexual intercourse during the fertile window on April 7, but it was brief, just a few thrusts.
Is there a possibility of pregnancy? Thank you.

Xiao T, 10~19 year old female. Ask Date: 2019/04/07

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the chances of pregnancy should be low.
It is always best to use contraception consistently and not to rely on the calendar method.
Wishing you good health.

Reply Date: 2019/04/07

More Info

When assessing the risks of unprotected sex during a woman's fertility window, it's essential to understand the menstrual cycle and how ovulation plays a crucial role in the likelihood of conception. The menstrual cycle typically lasts about 28 days, but it can vary from woman to woman, ranging from 21 to 35 days. Ovulation usually occurs around the midpoint of the cycle, approximately 14 days before the next expected period.
In your case, your girlfriend's last menstrual period was from March 28 to April 2, which suggests that her next period would be expected around April 26 to May 1. If we assume her cycle is around 28 days, ovulation would likely occur around April 12. Engaging in unprotected sex on April 7 places you close to her ovulation window, which is indeed a time of heightened fertility.

The risk of pregnancy from unprotected intercourse during this time is significant. Sperm can live inside the female reproductive tract for up to five days, so if ovulation occurs shortly after your encounter, there is a possibility that sperm could fertilize an egg. Even though you mentioned that the intercourse was brief, any exposure to pre-ejaculate fluid (pre-cum) can also contain sperm, which adds to the risk of pregnancy.

Given that your girlfriend's period was late by a week, it could indicate that her cycle is irregular, or she might be experiencing stress or other factors affecting her menstrual cycle. If she has not had her period by the expected date, it would be advisable for her to take a home pregnancy test to confirm whether she is pregnant. These tests are most accurate when taken after a missed period.

In summary, yes, there is a possibility of pregnancy from the encounter on April 7, especially if it was close to her ovulation period. If your girlfriend is concerned about the possibility of being pregnant, she should take a pregnancy test if her period does not arrive on time. Additionally, if you are looking to avoid unintended pregnancies in the future, consider discussing contraceptive options with her to ensure both of you are protected during sexual activity.

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Hello, the chances of pregnancy should be low. Wishing you good health.

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