who is the daddy?

I had sex with guy1 on Saturday night. and guy 2 Tuesday. during my ovulation. Wednesday was my highest possibility of pregnancy ( I was on birth control so didn't plan on getting pregnant) I'm stressing over who the daddy is and can't wait til baby is born and can do a dna test. is there a way to determine, or have an ideabefore a DNA test? ( I know it doesn't eliminate the possibility but guy 2 pulled out guy 1 came fully inside me) PLEASE NO RUDE COMMENTS

both guys know there is a possibility they are or are not... guy 1 says he is sterile but has no proof to back him up on that, when I asked how he knows hr just replied "I know" guy 2 said he isnt going anywhere if I need anything to ask