Baby daddy help

I went out a couple days ago i barley go out i hung with an old friend and we went to the mall and to her baby daddy house the whole time he wouldnt stop callin anyway he ends up asuming im cheating on him even though im preggers and just now a guy imboxed me on fb i dont even know the guy but i got so scared i hurry up and erased it cuz he has my fb messages to where they come to his phone i dont know wat to do