Period

Okay guys this is my first time posting and I feel kinda stupid for it being this but. I'm 16. Aaaaand. My boyfriend and I had sex today the condom broke and we didn't know. I don't know what to do because he didn't pull out. I haven't had my period yet but My mother said she'd send me off to a military school in Florida if she ever found out I had sex let alone got pregnant. Is it possible to have my period after sex and not get pregnant?