pregnant?

obviously there’s always a chance of pregnancy during sex, but i’m here to explain in hopes of someone who’s willing to not be harsh and just say “don’t have sex if you don’t want a baby”. anyways, my period is not regular, but my last one was october 3rd. i had unprotected sex oct 19. i typically always use condoms with my bf but this was a in the moment thing when we had none with us. he always pulls out even when wearing a condom just to be safe and we’ve been doing that for so long i trust his timing on “pulling out”, and he even pulled out time before actually cumming. i am so worried about pre cum tho. some say it contains sperm others say its only if he previously ejaculated and we hadn’t had sex in a few days but idk what to think. my app said i ovulated the 18th but with my period not being the most consistent idk what to think. i didn’t take plan b, took it a about 2 years ago due to condom breakage (just to be safe bc not gonna lie i was not experienced) and it made my period 3 months late. wow right. but can someone please help ease my mind!!!!