Pregnant?!?!

So I did have sex 3 days ago I wasn't thinking so does my partner he just stick his thing inside of me and then I realized that he didn't put a condom on I told him what he was doing then he say we will try it this way and I start freaking out and told him no because I wasn't on any birth control so be took it out and start looking for condom..is it possible if he didn't cum but just moment he stick it inside and I could be pregnant???im so nervous rn pls help me.