Took plan b then i got my period a week later but missed this month.?

my boyfriend and i had sex on may 20th and the condom broke but he didn't even finish. so i took plan b 2 days later then a week from that i got my period. not it's june 29th and i still haven't gotten it. my breasts are very swollen and i get cramps after i pee. help me please. am i pregnant or did the plan b just mess up my cycle?