I found out I am pregnant on November 20th 2012
An early ultrasound gave me a due date of July 27th 2013
I slept with my ex boyfriend a couple times in October 2012 and once again on November 7th 2012
I slept with my boyfriend between November 2 2012 and November 10th 2012
Who is the father? PLEASE HELP!!!!
When did your last period START? When exactly did you sleep with your ex?
There isn't enough information in your post.