my period isnt coming im on day 5 of placebos!

ok well, on on loseasonique and im on day 5 of my placebo pills and i still havent got my period! ive been on this pill for almost a year and ive never had a problem before. out of the whole three month pack i HAVE NOT missed any pills and i have taken them ALL on time. i am sexually active and whenever we have sex, my boyfriend uses a spermicidal condom AND he pulls out before ejaculation and the condoms never break. so what is my problem? is there a possiblity im pregnant even though i have a strong feeling im not? oh yeah i have hypothyroidism also. could that have anything to do with it?