Pregnancy Conception Date: Ultrasound & LMP Calculation

Question
Ok I'm losin sleep over this and I know the best way to get my answer but unfortunatly I need some reassurance until then! I dated a guy all summer and last slept with him on aug 11th I had a heavy normal period and but very unsure on exact date I then got back with my bf from high schoolaround I slept with him on sept 3! My lmp was somewhere between aug. 23rd and 26th! Had ultrasound done at 6 wk 5days and the tech says I conceieved around labor day! Had my 20 wk u/s done due date didn't change! I have talked to my dr about all of this and he says by my ultrasounds I conceieved early sept. And it was my bf! Could u please give me some more advise!

Answer
If you did not sleep with the summer guy after August 11th, and you had a period and then (according to very early ultrasound) conceived around Labor Day, then I don't see any way this baby could not be your boyfriend's.

I hope this helps you sleep a little better, and congratulations on your upcoming little one!