I don't know the exact day I got pregnant I had sex with my boyfriend June 6-7 . Ir an into my ex the around the 10 of the same month. Need your help in finding out the date I got pregnant my due date is march the 9 2013.

It is IMPOSSIBLE to know the exact date of conception.
Dating during pregnancy is simply Best Guess anyway.
If there is an issue with paternity then a DNA test will need to be conducted, safest is AFTER the birth.

With the dates you listed, only 3-4 days apart, there's absolutely no way to tell you who the father is without a DNA test. None at all. You'll have to wait until baby is born to find out who the daddy is.