he didnt cum in me, unprotected sex, didnt get my period, could it lead to a pregnancy?

Well, me and my bf did it on a friday but it only lasted like for a few seconds because i lost my virginity and it hurt very badly. but we had unprotected sex. he told me he wasnt gonna cum in me so that nothing can happen, and if he did it can lead to a pregnancy. actually he didnt cum in me. i was due on my period on sat-monday. but i never got it? but im still scared that it can lead to a pregnancy! im still young and have big dreams ahead of me, and i dont want anything to happen. should i be worried ? ? ? :'(