I had usually have irregular periods but when i do get it j get it two months in a row. I had a period on the 11-16 of march 2012. I had sex with my ex bf on march 18, 21 and 30 of march. In april 14th, i had sex with an old friend. I had a sonogram on aug 9th that said i was 20 wks pregnant. Then on the 14 that said i was 20 wks pregnant. I got a 12/29 due date. Then on sep 8th had another sonogram that said my due date was 12/25. Who could more likely be the father of my baby?? Please respond.