Pregnancy Chances After Unprotected Intercourse: Key Insights - Obstetrics and Gynecology

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When considering the chances of pregnancy after unprotected intercourse, several factors come into play, including the timing of the menstrual cycle, ovulation, and the effectiveness of emergency contraception. In your case, you mentioned that your last menstrual period started on November 20 and November 24, and you had unprotected intercourse on December 7.
Firstly, it’s important to understand the menstrual cycle. The average menstrual cycle lasts about 28 days, but it can vary significantly from person to person. Ovulation typically occurs around 14 days before the start of your next period. If your cycle is irregular, predicting ovulation can be more challenging. Given that you experienced ovulation pain, it suggests that you may have been close to ovulating around the time of intercourse, which could increase the likelihood of pregnancy.

Regarding the unprotected intercourse on December 7, if you were indeed close to ovulation, the chances of pregnancy could be higher. Sperm can live inside the female reproductive tract for up to five days, so if ovulation occurred shortly after December 7, there is a possibility that the sperm could fertilize an egg.

You also mentioned taking emergency contraception (Levonorgestrel, commonly known as Plan B) within an hour and a half after intercourse. Emergency contraception is most effective when taken as soon as possible after unprotected intercourse. It is estimated to reduce the risk of pregnancy by 75-89% when taken within 72 hours. The sooner it is taken, the more effective it is. Since you took it promptly, this significantly lowers your chances of becoming pregnant.

However, it is essential to note that emergency contraception is not 100% effective. Factors such as your body weight, the timing of ovulation, and how soon after intercourse you took the pill can influence its effectiveness.
If you are concerned about the possibility of pregnancy, you may want to wait until your next expected period to take a home pregnancy test. If your period is late or you experience any unusual symptoms, it would be advisable to consult a healthcare provider for further evaluation.

In summary, while there is a possibility of pregnancy given the timing of your cycle and the unprotected intercourse, taking emergency contraception significantly reduces that risk. Monitoring your menstrual cycle and being aware of any changes in your body will help you assess your situation better. If you have any further concerns or questions, don't hesitate to reach out to a healthcare professional for personalized advice.