Pregnancy Risks After Unprotected Intercourse - Obstetrics and Gynecology

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When it comes to understanding the risks of pregnancy after unprotected intercourse, several factors come into play, including the timing of the menstrual cycle, the effectiveness of contraception methods, and the nature of the sexual activity. Based on your description, it seems that you and your girlfriend had a mix of protected and unprotected intercourse, which can complicate the assessment of pregnancy risk.

Firstly, let's consider the menstrual cycle. If your girlfriend's last menstrual period (LMP) started on May 31, and assuming she has a regular cycle, ovulation typically occurs around 14 days after the first day of her last period. This means that if her cycle is about 28 days long, she would likely be ovulating around June 14. Sperm can survive in the female reproductive tract for up to five days, so if you had unprotected intercourse on June 12, there is a possibility that sperm could still be viable when she ovulates.

Now, regarding the use of condoms, they are generally effective at preventing pregnancy when used correctly. However, if the condom was removed during intercourse, there is a risk of sperm entering the vagina, which could lead to pregnancy. Since you mentioned that you pulled out before ejaculation, this method, known as the withdrawal method, is not entirely reliable. Pre-ejaculate fluid can contain sperm, and if any sperm were present, there is a chance of pregnancy.

Given that you had a mix of protected and unprotected intercourse, the likelihood of pregnancy is not negligible, especially if the timing coincides with her fertile window. If your girlfriend has a regular cycle and ovulates around June 14, the risk of pregnancy from intercourse on June 12 is higher than if it occurred at a different time in her cycle.

If your girlfriend is concerned about the possibility of pregnancy, it is advisable for her to take a home pregnancy test if her period is late. Most home pregnancy tests are accurate about a week after a missed period. Additionally, if she is experiencing any unusual symptoms or has concerns, visiting a healthcare provider for further evaluation and guidance would be beneficial.

In summary, while the use of condoms significantly reduces the risk of pregnancy, the combination of unprotected intercourse and the timing of ovulation can increase the chances of conception. If there is any doubt or concern, taking a pregnancy test and consulting with a healthcare professional is the best course of action.