I've never done it before but I have done sexual things but only with other AFAB people so this is a bit tricky for me... I'd say like the other commenter, maybe your hormones found them to be a "match" and "picked" that person to be the one you get hot and bothered for.
If you do have sex, like everyone else has been saying, WEAR PROTECTION AND TAKE BIRTH CONTROL.
Make sure this person isn't a loser either, make sure she stays and doesn't ghost you after one night or leave you with the baby if you end up getting pregnant.