have you taken all of your pills on time? have you accounted for any vomiting or diarrhea or medications that may interfere with your BC? did you have sex after you had entered your protection period?
if all of these are yes, then you don't have anything i worry about in my opinion. BC can lighten or reduce your period entirely. and, as you've only been on your break for two days, you still have the remainder of the week to bleed this time.
if you're worried, take a pregnancy test!