my lmp was 1 dec,i have a 27 cycle,slept with husband startinf from 9-14 dec ,then he left town the following day,im now 14 weeks 3 days,im not sure when did i conceive but doc says is 16 dec,i hope it gives u an idea
There's really no way to be 100% sure. Though dating scans are pretty accurate, that conception day can easily be wrong by a week or so. So if you had unprotected sex (pre ejaculate contains sperm) with two men within a week, either can be the father.
Since they were so close together it's really hard to tell. Sperm can live up to 4 days in the right type of environment. Sorry I can't give you more of an idea but it really is hard to say.