Period/birth control

So I finally went to see a gyno. She and I spoke about birth control and I figured being that I'm sexually active with my bf that I should go on birth control. Well I started it like the doctor said to when my period started. Here I am now going on two weeks and still have my period. My bf and I both spoke and he was worried and so was I. We decided that we didn't want me to continue to use it. Has anyone else when they started had an extra long period or could this just be my body not liking the pills that she started me on?