I had sex with one man on March 22... than I had sex with another man on April 6 exactly two weeks apart. I got a positive test result on April 18th. I never good with tracking my period. At my first doc appt. I told them my lmp was March 25... I not sure if it was before than thought. My due date is Dec 28th. I am 30wks... I'm afraid because every time I get an ultrasound they say my baby is showing a week or two ahead. But my due date had not been changed I told the man I had sex with in April that he was the father. Could it be possibility of the other man too..?

There is a possibility it could be either. There are variations in growth and development and it is neigh on impossible to narrow it down. Sperm can live for several days in the reproductive system and you can ovulate at any time during your cycle. So it could be either. A DNA test after the child is born is the only way to know who's the father.

Anything else is just guessing. Sorry.

A DNA test after the birth is the ONLY way you are going to know. Its also the SMART thing to do for reasons of Family medical history.

If you did, indeed, have a period AFTER the March sex encounter, then it is unlikely to have been that guy. Otherwise, yes it could have been. Due dates are based on the LMP, so if you gave them bad info, they have made a bad estimate.