I had sex with two different guys in a week and now i'm pregnant , guy 1 one nutted in me and we had sex multiple times but guy 2 did not who could be?

Impossible to answer: If only one male ejaculated inside of you then that is the answer. But, if both men were inside of your vagina with an uncovered erect penis and both leaked (pre-cum) even without ejaculation then either could be the father. If 'guy number 2" wore a condom and did not ejaculate anywhere but inside the condom then he cannot be the father. Sperm can survive up to five days inside the female.