Your Chances of Pregnancy: Key Factors to Consider - Obstetrics and Gynecology

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Understanding your chances of pregnancy involves considering several key factors, including your menstrual cycle, timing of intercourse, and any contraceptive measures taken. Based on the information you've provided, let's break down the situation.

1. Menstrual Cycle: You mentioned that your menstrual cycle typically lasts about 28 to 30 days, with your periods lasting around 7 to 8 days. This is a relatively normal cycle length. Ovulation typically occurs about 14 days before the start of your next period. Given your last period started on March 19, you would likely ovulate around March 5. However, cycles can vary, and ovulation can occur earlier or later than expected.

2. Timing of Intercourse: You indicated that you had intimate contact with your boyfriend on March 19, which is close to the time of your expected ovulation. While you mentioned that there was no penetration and no ejaculation, any pre-ejaculate fluid can contain sperm, and thus there is still a possibility of pregnancy. The chances of conception are higher when intercourse occurs during the ovulation window, which is typically a few days before and after ovulation.

3. Emergency Contraceptive Use: You took "妊止" (an emergency contraceptive) on March 20, which is within 72 hours after the potential exposure. Emergency contraceptives are designed to prevent pregnancy primarily by delaying ovulation. Since you took it shortly after the intimate contact, it significantly reduces the likelihood of pregnancy. However, it is not 100% effective.

4. Symptoms: The symptoms you are experiencing, such as abdominal discomfort and breast tenderness, can be early signs of pregnancy, but they can also be side effects of hormonal changes due to the emergency contraceptive. It’s important to note that these symptoms are not definitive indicators of pregnancy.

5. Next Steps: Given your situation, it would be advisable to wait until your next expected period to take a home pregnancy test. If your period is late or you continue to experience symptoms, a pregnancy test would provide more clarity. Home pregnancy tests are most accurate when taken after a missed period.

6. Menstrual Cycle Prediction: Based on your cycle history, if your cycle is regular, you can expect your next period around April 16 to 19. If you do not get your period by then, it would be a good time to take a pregnancy test.

In summary, while there is a possibility of pregnancy given the timing of your intimate contact, the use of emergency contraception significantly reduces that risk. Monitor your symptoms and consider taking a pregnancy test if your period is late. If you have further concerns or if your symptoms persist, consulting a healthcare provider would be beneficial for personalized advice and support.