Long first period on the pill.

Normally my period lasts a full seven days, but I just started taking the pill. I started it the first day of my period. That was two weeks ago on October 17th. It is now the 30th and I'm still on my period. Should I be worried at all. This period started out medium, instead of heavy not normal. So at first I thought it'll last a little longer, because it's the same amount of blood that's inside, just coming out slower than normal. But it seems like I've had more bleeding overall than what I've had in the past. Ive slowed down some, but I'm thinking I've still got another two days then I'm completely done. Is this normal?