You can go to babycenter.com to try and figure out your conception date through the ovulation calculator that they've provided. It should be able to tell you how far along you are. If not, you can always google, due date. Just put in your LMP and it will give you your estimated conception date as well. I'm going through a similiar problem. Except I had unprotected sex with my exhusband one day, and another time with a different guy. But it was protected. As you can see I'm extremely confused. But as to pinpoint a conception date, you can't exactly do that. It's just an estimation. I'm sorry you're going through something like this. I think a DNA test would probably be your best bet. You can actually have an amniocentises (sp?), which is where they use a needle to withdraw fluid from the womb. The baby sheds dead skin cells, and it's sent back to a labratory to test. You'll need the babies potential dads to come forth and give some DNA by swabbing his cheeks in his mouth. But, this test can cause problems and it is risky. You'll need to look up on it. Other than that, you'll have to wait until the baby is born so that you can do a regular DNA test. Hope this helps some. If you need someone to talk to, or any kind of other information, don't hesitate to email me. =]