I had sex with my ex in Oct 2011 around the 29 give or take 2 or the days. Then I had sex with my current boyfriend on Nov 27 2011, no question about that. I then found out I was pregnant on new years. I got and ultra sound around the end of Jan 2012 and it says I was 9w and 4d. My due date is the 19 of Aug 2012 but by my last period my due date is on the 26 of Aug. I know I had a period in Oct and I think I did un Nov. I know I didn't in Dec and so forth. It is now Aug 13 and I'm still pregnant. So is it my current boyfriend that I am claiming to b the father already or my ex

THere is no way of knowing WHO the father is until the child is born and DNA testing done.

WHen a doctor gives you an approximate fetus age its accurate to only plus or minus two weeks... that means it can be anone you slept with for an entire month... and in this case it was only days apart.

The date are almost a whole month apart

Oct 29 to Nov 27 still falls within that one month period. The state of current medicine and predictions can not be more specific than that, it's a very inexact science. You will still need DNA testing to know who the father is.