You will have to wait until the baby is born, then run a DNA check on the two men.
<h5>Sperm usually lives for up to 72 hours; therefore, a woman can conceive any time within those three days. Your post is not a question, although you ended it with a question mark.</h5><h5><br>If you are asking how you can determine who the father is, you have options. </h5><h5>1) DNA test</h5><h5>2) ultrasound to determine how far along you are</h5><h5><br>I would assume that your OB will tell you that a DNA test is the way to be 100% certain.</h5>