Paternity Test

Has anyone had to have a paternity test done to determine if the father of your child is who you think? If my test comes back positive, I have 2 potential baby fathers and am kind of freaking out about determining who is the father. If I can’t figure it out by using the weeks of how far along I would be, is there a way to do it before birth? Is it covered by medicaid? If not how expensive is it and how many different options is there? Is it better to wait till after the baby is born? Please please help I need all of the input I can get.