Problem is sperm can live for up to a week in perfect conditions. Which means you have a 3 day difference between men AND ultrasounds in early pregnancy can be off by a week as well. It's too close to tell, unfortunately only a paternity test will let you know.
I believe there are no free ones. You will have to pay to figure it out, the price can range anywhere from $80-$500. You can ask your doctor for reliable paternity testing facilities. You also need to make sure you talk to both guys about this and that there's the chance they might not be the father.
Thanks so much for the advice. I really hate that i got myself into this situation...guess i will have to wait and see...do u know of any free paternity testing??
They can date your pregnancy more after the first utlrasound. that will atleast help you out with the conception date more. (just remember they start the dating of your pregnancy 2 weeks before conception.)
But you will have to really get the DNA testing to be 100% sure.
I think a DNA test is the answer to your problem.Believe me, its the best route to take instead of guessing!!