My Boyfriends Condom Broke While We Were Having Sex So

my boyfriends condom broke while we were having sex so the day after i took a plan b pill, exactly a week later im not sure if it was my period or not but i did bleed like a normal period for a whole week but now im having cramps with no period i feel sick like nauseous but im not vomiting, back pains and more discharge then usual im scared the pill didnt work & i might be pregnant