Absolutely!! Not only can precum have sperm in it in general, but he went back in right after ejaculating, which means there was definitely live sperm still in his tract that would come out with precum... If u don’t want to get pregnant then don’t have unprotected sex!!

Yes , use condoms

Yes this is how I got pregnant with my first lol

Unprotected sex can always get you pregnant. Pull out if NOT a form of protection.