My boyfriend and i had sex with condom after he came. we had sex again but without protection. this time he did not cum. can i be pregnant?

Unfortunately Yes: Remember that sperm is present in pre-ejaculatory & post-ejaculatory fluid. You should always have your partner wear a condom to prevent pregnancy, not only when he is about to ejaculate. Otherwise, you can get pregnant. Sorry.

Unprotected: It sounds unlikely, but thsi is still called unprotected intercourse. If you are trying to avoid pregancy this is still a risk, even if it is a small one.