I have been on tri-nessa for a little over three months. I have never missed a pill and take it roughly the same time everyday. I started lightly bleeding about a week before my period was due, while still on the active pills. I'm not entirely sure if this was my period or not. As it was mostly brown blood more than anything else, and only seemed to pass through after urinating. It finally stopped about a week later. What concerns me is after me and my partner had sex, the bleeding started over again. Also, I feel like I should mention that I am 5 days into the inactive pills.