birth control questions?

Hello Ive been on birth control for almost two months now. My first pack of birth control pills I didn't take the placebo pills because I didn't want to receive my period and so I just moved into the next months pills. However now I have been bleeding really heavily and have had strong consistent cramps for over a week. I'm confused and a little sacred because not even when I'm on my period I experience these symptoms. I'm not sure if this is normal because moron mu understanding the pills are supposed to stop my period?