Determining Paternity: Pregnancy Dates and Cycles - Obstetrics and Gynecology

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Determining paternity can be a complex issue, especially when there are multiple sexual partners involved around the time of conception. In your case, the timeline of your menstrual cycle and sexual activity is crucial for understanding the potential paternity of the child.

Your last menstrual period (LMP) was on February 4, and you have a cycle length of approximately 30-32 days. This means that ovulation likely occurred around February 19 to February 21, which is typically about 14 days after the first day of your last period. Given this timeline, the sexual encounter with Partner A on February 18, where protection was used, would likely not result in pregnancy. However, the encounter with Partner B between February 21 and February 24, where no protection was used, falls right within the ovulation window, making it a potential time for conception.

When you discovered you were pregnant on March 8, the doctor estimated that you were 2-3 weeks pregnant. This estimation is based on the gestational age, which is calculated from the first day of your last menstrual period. Therefore, if you were indeed 2-3 weeks pregnant on March 8, it aligns with the ovulation period occurring around February 19 to February 21.

Given this information, it is more likely that Partner B is the biological father of your child, as the unprotected intercourse occurred during your fertile window. However, it is important to note that sperm can survive in the female reproductive tract for up to five days, which means that if ovulation occurred later than expected, there could still be a slim chance of paternity from Partner A.

If you are seeking definitive answers regarding paternity, the most reliable method would be to conduct a paternity test after the baby is born. This can be done through a simple DNA test that compares the child's DNA with that of the potential fathers. Paternity tests are highly accurate and can provide you with the clarity you need.

In summary, based on your menstrual cycle and the timing of your sexual encounters, it is most likely that Partner B is the father of your child. However, for absolute certainty, a paternity test after the birth would be the best course of action. It is also advisable to discuss your concerns with a healthcare provider who can guide you through the process and provide support during this time.