If you got the due date by an 11w4d ultrasound, you can trust it to be close (within a day or two). I'm sorry but as you already know, that gives you:
Probable date of ovulation: October 8, 2012
Possible dates of conception: October 4 to October 12, 2012
Due date: July 1, 2013 (40 weeks)
You're definitely going to need a DNA test.
The earliest ultrasound was 11 weeks 4 days
The earliest ultrasound was 11 weeks 4 days
I got my due date dec 14th , Nov 11 I spotted a plug and spotted two weeks straight. I was sick last part of Nov. I did a home test Nov 24th
Odds favor the boyfriend, but there is no way to know since both men are in the right range of time. When did you get your due date, and how did you get it? If it was by ultrasound, how early in the pregnancy?