I had unprotected sex i was a virgin til last friday my bf tells me he didn't cum are there a chance i can still be pregnant please explain cleary?

Yes: There can be a small amount of semen fluid with sperm present even if a man does not fully ejaculate. So yes, there is a small chance you could get pregnant from having sex this one time. If your period is late or does not come you should check a pregnancy test.

Ouch: Even though he did not come, there is still a small amount of fluid that has sperm and you could get pregnant. Please use contraception.