How do I identify the paternity of a child?

There was no conception while being in a relationship with man A. Sperms inside the vagina after ejaculation remains alive only for 48 to 72 hours, and after that, they die and get destroyed. So, man, A can never be the father. If you are positive for pregnancy testing in a laboratory (beta-hCG urine levels testing), then it means that Man B is the father of that baby.

100% confirmation for legal aspects may sometimes need paternal DNA testing. In your case, it does not need to be mandatory.

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Go for a laboratory test as advised below under investigations. If that is positive, it means you are pregnant. Now I come to the paternity issue between man A and B. Man A, you and pregnancy: While you were with man A, you never became pregnant. If you are worried and confused about the sexual intercourse with him might not have caused you to be pregnant. No, it is not possible as you have had your periods on the suspected date and time. And there was nothing left of him with you when you stopped sexual interaction with man A. Man B, you and pregnancy: Your periods were all normal before you started a sexual relationship with man B. But as you both remained together, you missed your periods. Now, if you are pregnant, it surely is due to man B, and he is the father of this fetus.

Laboratory urinary pregnancy test (beta-hCG Levels test) to confirm the pregnancy. If you want to be 100% sure about this paternity issue, go for man B and fetus DNA testing (the genetic paternity testing).

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