Paternity Testing: Who is the Likely Father? - Obstetrics and Gynecology

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When it comes to understanding paternity testing and determining who the likely father is in a situation like yours, several factors need to be considered, including the timing of sexual intercourse, the use of emergency contraception, and the fertility status of the individuals involved.

In your case, you had sexual relations with two men, A and B, around your ovulation period. You had intercourse with A on May 1, which was the day before ovulation, and you took emergency contraception approximately 18 hours later. This is significant because emergency contraception is designed to prevent ovulation or fertilization if taken shortly after unprotected intercourse. Since you took the emergency contraceptive pill (ECP) after having sex with A, it is possible that it could have prevented ovulation from occurring, thus reducing the likelihood of pregnancy from that encounter.

On the other hand, you had multiple sexual encounters with B on May 2, 3, and 13. Since B had a vasectomy in January and a subsequent sperm count test in April that showed zero sperm, it is highly unlikely that he could father a child. A vasectomy is a surgical procedure that cuts and seals the vas deferens, preventing sperm from mixing with semen during ejaculation. If B's sperm count is indeed zero, then he would not be able to impregnate anyone, regardless of the timing of the sexual encounters.

Given these circumstances, if you were to become pregnant, the likelihood is that A would be the father, especially since you had unprotected intercourse with him the day before ovulation, and the emergency contraception may not have been effective if ovulation had already occurred. If B's sperm count is confirmed to be zero, this would further support the conclusion that A is the likely father.

In summary, if you were to become pregnant, the probability is significantly higher that A is the father due to the timing of the sexual encounters and the fact that B has a confirmed lack of viable sperm. If you are considering paternity testing, a DNA test can provide definitive answers, as it analyzes the genetic material from the child and compares it to that of the potential fathers. This is the most reliable method to establish paternity.

It's important to consult with a healthcare provider for personalized advice and to discuss any concerns you may have regarding pregnancy, contraception, and paternity testing. They can provide you with the necessary resources and support to navigate this situation.