Pregnancy scare

Okay so my bf and I had sex without a condom and he wiped off the precum before he entered me and he didn’t cum in me but it was my last fertile day and my period is a week late and tomorrow it will have been three weeks since it’s happened I’ve also been going through a lot mentally and emotionally lately and I workout 5 days a week so I don’t know can someone please help me out with what could be happening with my body bc I have no idea what’s going on