What Are The Chances Of Getting Pregnant Without Ejaculation?

I had sex with my boyfriend 3days ago. This is silly but i dont know why it happened too. He was trying to put on his condom, and realised it was on the wrong side so he flipped it back and managed to roll the condom down. I'm worried that i would get pregnant, as im not sure is there is any precum on the tip of his penis when he wore it wrongly and flipped it back. However, he'd piss a few times that day before we had sexual intercourse, so even if he had precum at the tip of his penis there shouldnt be any semen.

But im still very worried about getting pregnant!! what are the chances of getting pregnant?
can someone please reply me soon? thanks