I had protected (condom) sex w/ Partner A on October 21, 2011. I got a period of 5 days in length on October 25, 2011. Then I had unprotected sex w/ partner B about 5 times after my period. Took pregnancy test on Nov. 26, 2011. Positive. Due date according to last period = July 31, 2012 due date from ultrasound at 9 weeks = Aug 3, 2012. Whose the father ??? partner b right ....