WHOS THE DAD😕. NO NEGATIVITY

I have a possible situation concern regarding my baby and father of baby, so I would like to start off by saying if you're going to be negative then don't bother replying. Okay so me and the guy I've been with for 3 1/2 years were on a break for awhile, I found myself having sex with a guy(NOT HIM) around May 6-8(unprotected, stupid I know) , fast forward a couple weeks later me and the man of 3 years got back together on May 23( had unprotected sex LIKE ALWAYS) . First day of last cycle was May 28... Doctor did tell me I approximately conceived around June 10 . Basically I'm asking who is mostly to be the dad Mr. Random or Mr. 3years ? 

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