Conception Trouble!

I was suppose to have my period by June 30th, 2015. Clearly I didn't so me and boy A had sex July 2nd and again July 10th and July 16th. However me and boy B had sex July 16th as well. I found out I was pregnant August 2nd. My first appointment Aug 25th I was told I was 7 weeks and 3 days. Next appointment September 22nd I was 11 weeks and 5 days. My most recent appointment Nov 23rd I was 20 weeks and 4 days. My due date went from April 10th to April 5th. Please help me out could it be boy A or boy B