Hi, what is seeming off to you? It all sounds like your August guy not your July guy, it all does line up. Do you know that a doctor counts "weeks pregnant" as starting from the (computed) first day of your last period, not from the (assumed) day of conception? Being told you are 8 weeks on September 22 is the same as being told you conceived around August 11, which is when you were with Mr. August.
With a due date of 5/3/16 would put your conception somewhere around the 11th of August