His and Her Health

I am currently taking Kariva. This is my second time on it and I have been on it since the middle of summer. I recently got my period and it is very lite. Once Last summer I had gotten my period that was also very lite, but it did not stop there. Every day for a month and a half I got a brown thick discharge. I took my self off and was put back on. It did not happen the second time I was on it. I had taken myself off a second and I am back on it again time. But I have a feeling, in fact im pretty sure that I am getting that same brown discharge again. This really annoys me. I can't stand having to wear a pad every day , and dont like to have sex while I have this, I feel disgusting with my boyfriend down there even with a condom. Can anyone tell my why this is happening? Could taking a different pill help? If its just dry blood how long does it last? It is ok to have sex while I have this? I really need some advice, thank you