I don't know what to do.. male/women/Doctor help needed?

ok me and my boyfriend just had but the condom ripped but he said he did not ntt in side of me so i should be ok but he said go get checked just in case but the day after i got my period so i don't think i am pregnant. help i don't know (o an he said some thing about pre-nut)can you get pregnant from pre-nut