I need someone to please help me figure this out :(

[Perbre8777]

On jan 29 I had unprotected sex a one night stand .. I remember that on feb 9 th I had a period I don't remember if it was the beginning the middle or the end I just know I had a period that day and I don't remember if it was normal.. Then in feb 23 24 and 28 I had unprotected with my current partner .... In march 11 th I found out I was pregnant ... My question is , can there be a chance that the baby is from the jan 29 guy ... ??? my due dates so far have been between nov 14 to the 16 ? Can they tell between if I concived on jan 29 and feb 23,24 can they tell the difference on the fetus growth???please help I'm going nuts ..( im very confused n stressed! On march 21 I was 6 w 0 days from my Lmp BY US 5 w and 4 days and on April 8 I was 8 w and2d by Lmp and by US I was 7 w and 2 days ...I would truly appreciate the feed back