I am 11 weeks pregnant and my due date is march 3rd 2013.. the father could be between two men and I just need to get help on what others may think... ok... my last period was may 27 2013 and I had sex with my current boyfriend anytime in may.. with the other guy I had sex with him on June 13 2013 my conceive date is june10 2013.. who can be the father?

You didn't conceive on June 10 if you had no sex between May 31 and June 13.
And 11 weeks ago is the end of May, somewhere right around your period.
Weeks pregnant is a guess based on LMP, unless you know exactly when you had sex only once in a long stretch of time.
So you conceived on June 13 or shortly thereafter, or you conceived at the end of May. So either man can be father.
You will be able to tell a bit more as the fetus grows, but only DNA knows for sure. Could you have even forgotten exactly when you last had sex with man # 1?
Based solely on the fact that most women ovulate mid-month, chances are good for June 13 conception (with due date calculated from LMP, not conception). BUT again, you can't really know. And if the ultrasound showed an embryo more of a size of the earlier date, that evens the odds again. Could be either man.