i had sex and i think myy boyfriend precum inside of me can i get pre cuz of that

Yes pre-cum does contain active sperm in most men. Are you about to ovulate or was ovulating at the time of the sex? The only way to prevent pregnancy is to have him put on a condom before his penis comes anywhere near your vagina. If he rubs his penis up against your vagina with pre-cum on it he could get you pregnant. Some women can get pregnant really easy while others have a hard time but anytime you're having unprotected sex there is a chance of becoming pregnant.