Paternity Uncertainty: Determining the Father of Your Baby

Question
Hi. i would really appreciate it if you would help me out with a certain question. i am pregnant and i am 32w and 4d pregnant. my problem is i had sexual intercourse oct.3 with my ex and oct.8 with my boyfriend. i had an ultrasound when i was 10w1d on 12/6/10 and at 16w4d on 01/20/11 both giving me a due date of july 3! i asked my doctor when i conceived and he said on or around oct.10/11! i would like to know who is more probable the father of my baby. i kno a dna test would prove it 100% but im really struggling and can't afford it. i am trying to get everything together for my child. i live from place to place with family members and friends and it's really stressing me out. then with this situation i am really stressing and i know its not good for me and my baby! can you please help me and take some relief off my shoulders?! thanks in advanced!

Answer
With a due date of July 3, my calculations give a conception date of Oct. 10.  That should be accurate within 7 days, meaning possible conception of Oct. 3 to 17.  The Oct. 8 date is closer to Oct. 10, so that makes it the more likely day you conceived, but the Oct. 3 date is possible.  There is no way to be sure, other than a DNA test.  I'm sorry.