I have been on Yaz for almost 2 years and have never missed a pill. I am sexually active but we use the pull-out-method. This month, I had my period and then a week after experienced brown discharge and it still has not really gone away. I am worrying myself sick literally thinking this is something it is not. I have heard that the pill causes breakthrough bleeding and I am hoping this is all it is? My next period is due in a week.