Late Periods: Could It Be Pregnancy? - Obstetrics and Gynecology

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When it comes to understanding late periods and the possibility of pregnancy, it's essential to consider several factors, including the timing of ovulation, the menstrual cycle, and the effectiveness of contraceptive methods used during intercourse.

In your case, your girlfriend's last menstrual period started on August 15, with an expected next period around September 15. If she had unprotected intercourse on September 8, it is important to note that this date falls within her fertile window, which typically occurs about 5-6 days before ovulation. If her cycle is regular, ovulation likely occurred around September 1-2, making September 8 a potential time for conception if sperm were present.

However, since you mentioned that a condom was used during intercourse, this significantly reduces the likelihood of pregnancy, provided the condom was used correctly and did not break or slip off. Condoms are about 85-98% effective at preventing pregnancy when used properly. Therefore, while there is still a small chance of pregnancy, the risk is considerably lower than if no protection had been used.

Now, regarding the late period: a delay of five days can be concerning, especially if your girlfriend's menstrual cycles are typically regular. Stress, hormonal fluctuations, changes in weight, or even illness can cause menstrual irregularities. It's also worth noting that some women experience changes in their cycle due to various factors, including lifestyle changes or health issues.

If your girlfriend has never experienced such a delay before, it might be a good idea for her to take a home pregnancy test. These tests are generally reliable and can provide results as early as the first day of a missed period. If the test is positive, it would indicate that pregnancy is a possibility, and she should follow up with a healthcare provider for further evaluation.

If the test is negative and her period still does not arrive, it would be advisable for her to consult a healthcare professional. They can help determine the cause of the delay and whether any further investigation is needed.
In summary, while there is a possibility of pregnancy due to the timing of intercourse relative to her ovulation, the use of a condom significantly lowers that risk. A late period can be caused by various factors, and taking a pregnancy test would be the next logical step. If there are any concerns or if her period does not arrive soon, seeking medical advice would be beneficial.