I had sex with my boyfriend but the condom broke. a week and a half later i got my period, but it wasn't the same as my previous periods?

Very likely you are: fine...not pregnant. Even the stress of worrying about a possible pregnancy could cause a period to be a little different: shorter, heavier, longer, lighter, whatever! I guess I can't be sure from your question, but if you are very concerned about unintended pregnancy, then I suggest a more reliable form of birth control: implant, IUD, Depo, pill. Continue to use condoms for STD prevention:)