Is the Risk of Pregnancy High After Unprotected Intercourse and Emergency Contraceptive? - Obstetrics and Gynecology

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When it comes to the risk of pregnancy after unprotected intercourse, especially during the ovulation period, it is essential to understand the factors at play. In your case, you mentioned that there was external friction and brief penetration just before your girlfriend's ovulation. Given that her menstrual cycle has varied between 28 to 35 days, ovulation likely occurred around the midpoint of her cycle, which would be around 14 to 21 days after the first day of her last menstrual period (August 2).
Since you had unprotected intercourse close to her ovulation, there is a potential risk of pregnancy. Sperm can survive in the female reproductive tract for up to five days, which means that if ovulation occurred shortly after your encounter, there could be a chance of fertilization. However, since your girlfriend took emergency contraception (EC) within 2 to 3 hours after the intercourse, this significantly reduces the likelihood of pregnancy. Emergency contraceptive pills (ECPs) are most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours, and can reduce the risk of pregnancy by up to 89% when taken within that timeframe.

Regarding when to take a pregnancy test, it is generally recommended to wait at least one week after the expected date of her next period for the most accurate results. Since her last menstrual period was from August 2 to August 8, if her cycle is regular, her next period would be expected around September 6 to September 13, depending on her cycle length. Therefore, taking a pregnancy test around September 13 would provide a reliable result.

As for the second part of your question regarding the risk of pregnancy from a drop of semen in hot water during oral sex, the risk is extremely low. Sperm need a specific environment to survive and swim toward an egg for fertilization to occur. Once sperm is exposed to air or water, its viability decreases significantly. Therefore, the likelihood of pregnancy from this scenario is negligible.

In summary, while there is a potential risk of pregnancy from the unprotected intercourse close to ovulation, the use of emergency contraception greatly reduces that risk. It is advisable to wait until after the expected period to take a pregnancy test for accurate results. The risk from the second scenario involving semen in water is minimal and unlikely to result in pregnancy. If there are any concerns or if your girlfriend experiences any unusual symptoms, it would be wise to consult a healthcare provider for further guidance.