Chances of pregnancy?

Hi all,

I stopped my birth control after 11 years about a week or two ago. Two days ago I kind of had sex. We didn’t finish because he kept going flaccid and never fully entered me. Only like 2 inches maybe. He informed me that he had masturbated before I came over. I know there is a chance of precum carrying sperm, but how likely is that really to actually get you pregnant? I’m also pretty sure I’m ovulating for the first time after stopping BC, my mucus is egg white looking and my sex drive is through the roof. I won’t be upset if I’m pregnant, just wondering how likely that really is since he didn’t actually finish in me and only put it in a couple inches max.

Thanks!