Pregnancy help

hi everyone one i have a question. So my last period was on april 3,2017 and i remember having sex with my friend a couple of weeks after like around the 11-17 of that same month. Next month i went out with another friend and we were hanging out and at a club and drinking and we ended up having sex at his house it was on may 3 after that i found out i was pregnant and it worried me because im not sure whose baby im having is it possible that im having he second guys baby?