Period 04/21 sex with guy A 04/28 and guy B 05/02 don't know when I conceived due dates given to me where 1/27 & 1/26 my cycles are regular when I went for my ultrasound on 10/10 they said my baby is a little under weight and they had to check my old ultrasounds to get am accurate due date and it was 1/26 bt I know my baby is under weight from stress and not rememberin to take my prenatals this is already a stressful situation I really just need opinions

There's absolutely no way to determine who the father is based on due dates and the size of the baby. You'll have to wait until the baby is born and have a paternity test done.

Sorry, these dates are within a few days of each other. There is no way possible to determine which date you concived, conception dates are good at best give or take two weeks, but even give or take a week is still more than this.

So you will have to wait till child is born and have a DNA test done to find who the father is.