I am not dumb I swear

My SO and I always use condoms. Every time. Last night we started off without one.. but after about 60 seconds he put a condom on. Now, when we are together we have sex every day that we are. So I will stay with him for like a week at a time, so every night..

He produces A LOT of pre cum.

I am not on birth control

Before you act like I am stupid, etc.. just remember that we ALWAYS use condoms.. lol

My question is, how great of a chance is it that I could fall pregnant? Like REALLY slim? I’m not stupid, and I know that you can get pregnant from pre cum.. but how often does that even really happen? Especially since we only did it without one for about a minute, and finished sex with protection.