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

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When it comes to understanding the chances of pregnancy after unprotected intercourse, several factors come into play. Based on your description, it appears that you had unprotected sex on May 22, just one day before your expected period on May 23. While your menstrual cycle is typically regular, it’s important to note that various factors can influence the timing of ovulation and the onset of menstruation.

Firstly, the likelihood of pregnancy from unprotected intercourse depends on the timing of ovulation. In a typical 27-30 day cycle, ovulation usually occurs around 14 days before the start of your next period. If your cycle is 28 days, for example, ovulation would likely occur around day 14. Since you had unprotected sex just one day before your expected period, the chances of pregnancy are relatively low, especially if your partner did not ejaculate inside you. However, it is important to remember that pre-ejaculate fluid can contain sperm, which means there is still a small risk of pregnancy.

The fact that you had an ultrasound on May 23 and the doctor noted that your uterine lining was thickening is a good sign that your body is preparing for menstruation. Thickened endometrial lining is typical in the luteal phase of the menstrual cycle, which occurs after ovulation and before menstruation. The doctor’s recommendation of a medication to induce your period suggests that they believe your menstrual cycle may be delayed due to factors such as stress or hormonal fluctuations, rather than pregnancy.

Regarding your concern about taking emergency contraception (the "morning-after pill"), it is generally recommended to take it within 72 hours after unprotected intercourse for it to be effective. Since you had unprotected sex on May 22 and your period was expected on May 23, taking emergency contraception may not be necessary at this point, especially since you have already consulted with a healthcare provider who has assessed your situation.

If your period does not arrive within a week or so after the expected date, it would be prudent to take a home pregnancy test to confirm whether or not you are pregnant. These tests are quite accurate when taken after a missed period. If the test is positive, you should follow up with your healthcare provider for further evaluation and guidance.

In summary, while the chances of pregnancy from the described encounter are low, it is not impossible. The best course of action is to monitor your menstrual cycle and take a pregnancy test if your period does not arrive soon. Additionally, if you find yourself frequently anxious about the possibility of unintended pregnancy, consider discussing more reliable contraceptive options with your healthcare provider to help alleviate such concerns in the future.