Is it possible?

My boyfriend and I had sex yesterday. We used a condom and before we finished he came in the condom thrusting pretty deep inside but I told him to stop and he did. When he slid out from inside, the condom was full of his semen. I’m very scared that when he did that I can get pregnant and I’m not ready for pregnancy at all yet. Can I get pregnant that way? I stopped being fertile three days ago.