Will i be a fucked up person if?....

i have a boyfriend of 2 years.... I was drunk with my friends at a bar and had sex with this random guy and got pregnant but didn't tell my boyfriend that it's not his baby? BECAUSE i fucked up really bad.. Now i don't know if he's the father or not... I think he is because me and my boyfriend never could have a baby ... Now all of a sudden i'm pregnant!!!!!!! Omg What should i do ??? hide it or ?????