Could I be pregnant? HELP!

Me and my boyfriend had sex while I was on my period, but i was at the very end. There was barely any blood. I gave him a hand job and he had slimy things come out his D, but it was definitely not sperm. I’m guessing it was pre-cum though. Then I gave him a blowjob and it still kept coming out. Then he put his D in me while he had that “precum?” on his D? Do you think it was pre cum & could I get pregnant? *we didn’t use a condom & im not on contraception*