Okay so please no negative comments, I feel horrible enough about the situation. My LMP was 11/07/12 .. my expected due date through calculations was 08/14/13 and as of today 03/11/13 I was supposed to be 17wks6dys today was my first sonogram and I showed 17wks1day so I have the same due date. I had sex with my current partner the 19 through 21st of November an someone else on the 29th of Nov. Who has the greater chance of being the father?