brown discharge on YAZ???

I take yaz as a form of acne medicine and my doctor told me to take the first white pill (placebo pill) on the first day of my period and then continue on to the real pills, which i did. then, when it came time for the white pills again, i didn't get my period until about the 3rd white pill. then, my period stopped but now i just have brown discharge. it's been almost 2 weeks since those placebo/white pills ended and i still have the discharge...is this normal??? it's only my second month on the pill.. please help!!