Hi, how do you get the 6 weeks 1 day figure, did a doctor give it to you from an ultrasound?
I think you will only be able to tell by getting a DNA test. They are very costly if done before the baby comes, but if you want one before the birth be sure to use either Ravgen or the DDC, not some charlatan so-called lab, and to test with both men. If you wait and test after the baby comes, use a lab recommended by the family courts in your area of jurisdiction, not a drugstore test. The kind where people show their ID and get photographed. And again, test with both men.