What's the Chance of Pregnancy After Unprotected Intercourse? - Obstetrics and Gynecology

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The chance of pregnancy after unprotected intercourse can vary significantly based on several factors, including the timing of the menstrual cycle, the presence of viable sperm, and individual fertility. In your case, let's break down the situation to provide a clearer understanding.

1. Timing of Intercourse: The menstrual cycle typically lasts about 28 days, but it can vary from person to person. Ovulation usually occurs around 14 days before the start of the next period. If your girlfriend's period started on March 22 and lasted until March 28, she would likely ovulate around April 5 to April 7, assuming a regular cycle. Since you had unprotected intercourse on April 2, 3, and 5, this timing is close to her ovulation window, which increases the likelihood of pregnancy.

2. Sperm Viability: Sperm can live inside the female reproductive tract for up to five days. Therefore, if sperm were present during the unprotected intercourse on April 2 or 3, they could still be viable when ovulation occurs a few days later. Even if you withdrew before ejaculation, pre-ejaculate fluid (pre-cum) can contain sperm, which means there is still a risk of pregnancy.

3. Withdrawal Method: While the withdrawal method (pulling out) is often used as a form of contraception, it is not very reliable. Studies suggest that about 22% of couples who use this method as their only form of birth control will experience an unintended pregnancy within a year. This is primarily due to the difficulty in timing withdrawal perfectly and the presence of sperm in pre-ejaculate.

4. Emergency Contraception: Since you mentioned that your girlfriend did not take emergency contraception after the unprotected intercourse, it is important to note that this method can significantly reduce the risk of pregnancy if taken within 72 to 120 hours after unprotected sex, depending on the type of pill. If there is concern about potential pregnancy, it may be worth discussing this option with her.

5. Pregnancy Testing: If your girlfriend's period is late, she can take a home pregnancy test. Most tests are accurate about a week after a missed period. If she experiences any unusual symptoms or has concerns, it would be advisable for her to consult a healthcare provider for further evaluation and guidance.

In summary, given the timing of the unprotected intercourse relative to her ovulation, there is a possibility of pregnancy. The risk is heightened by the fact that sperm can survive for several days and that the withdrawal method is not foolproof. If there are concerns about pregnancy, a home pregnancy test or consultation with a healthcare provider would be the next best steps.