should I be worried

I am not on B.C. but me and my bf have sex and we ONLY use condoms. sometimes when we have sex he will put his penis in me literally for like 2 minutes and we’ll have sex for that 2 minutes and then he will put a condom on for the rest of us having sex and if he finishes then he finishes in the condom. I know there is always a chance of getting pregnant but since he doesn’t finish in me will i be okay ? *this did not happen during my fertile window either*