Could I Be Pregnant? Risks After Protected Intercourse - Obstetrics and Gynecology

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When considering the possibility of pregnancy after protected intercourse, it's important to evaluate several factors, including the timing of your menstrual cycle, the effectiveness of the contraceptive method used, and any symptoms you may be experiencing.

In your case, you mentioned that you had sexual intercourse with your boyfriend on December 10-11, and you used a condom throughout the encounter. Condoms are a highly effective form of contraception when used correctly, with a failure rate of about 2% with perfect use and about 18% with typical use. This means that if the condom was used properly and did not break or slip off, the likelihood of pregnancy is significantly reduced.

You also noted that you have a longer menstrual cycle, averaging around 48 days, with your last period starting on November 9. Given this information, it is essential to understand how ovulation works. Ovulation typically occurs about 14 days before the start of your next period. If your cycle is 48 days long, you would likely ovulate around day 34 of your cycle, which would be approximately December 23. Since you had intercourse on December 10-11, this would be before your ovulation window, making it less likely for you to conceive.

However, you mentioned experiencing lower abdominal pain on December 11 and subsequently received a progesterone injection to induce menstruation. This could indicate that your body was preparing for your menstrual cycle, and the injection is often used to regulate or induce a period. It is not uncommon for hormonal treatments to cause temporary changes in your cycle, which might explain the delay in your period.

As of December 20, if your period has not arrived, it could be due to several reasons, including hormonal fluctuations, stress, or the effects of the progesterone injection. If you are concerned about the possibility of pregnancy, it would be advisable to take a home pregnancy test. These tests are generally accurate when taken after a missed period, and they can provide you with peace of mind.

In summary, based on the information provided, the chances of pregnancy appear low due to the use of a condom and the timing of your intercourse in relation to your ovulation. However, if your period does not arrive soon, taking a pregnancy test and consulting with your healthcare provider would be prudent steps to take. They can provide further guidance and support based on your individual health needs. Remember, understanding your menstrual cycle and how contraceptive methods work can empower you to make informed decisions about your reproductive health.