Our expert says:
Sperm can survive up to 72 hours in the vagina. Outside the body it may only survive for up to 2 hours before it degenerates.
If she is pregnant, (ask her to provide you with a blood test result - even better go with her to have it done) and you feel that you are maybe not the father, I think you should have a paternity test done as soon as the baby is born.
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