I really wish I could figure out when I got pregnant. I was in a relationship that ended June 8th and got into another that next week. My due date is march 9th..

Well 9 months before your due date is the best guess you currently have.
You will only be able to tell 100% who the father is though a DNA test.

That close, you won't know until the baby is born and you have a DNA test, if you want.

There is no way at all, to determine a due date within one week. So if you had sex with more than one person, within a couple week time frame, you will have to wait till baby is born and do a DNA test