I have a very serious issue I'm faced with and I need a physicians expertise. I am 4 weeks pregnant as of Sunday November 13, 2011. I had sexual intercourse Saturday night, October 29, 2011 and before day in the morning around 1:30 a.m on Monday October 31, 2011 with someone else. The fertility calculators all say I conceived October 30, 2011. Would guy #1 or guy #2 more likely be the father? The first day of my last cycle is 10/16/11. Please help to enlighten me if you can.