Obviously a DNA test is called for. I don't think the evidence rules you out. You might need to talk to a lawyer about how to make that happen if the woman is unwilling.
Not specifically. But the other man is basing it (to my knowledge) off the paper that shows 73HcG on December 11th. According to my research online, if conception was indeed at Nov 14th, the HcG levels would get over 1000, not 73.8
The other partner is her bf before me. She went back to him in late Jan and they are both claiming it's his. I have no info on Ulta sounds or her last period.