I just fell down the stairs--should I go to the doctor?

I'm 16. I was walking down my stairs and I don't know how, but I managed to trip and I tumbled down the stairs and onto the floor below. It hurt REALLY bad and I couldn't move for a few seconds because I was in so much pain, all I could do was lay on the floor and cry. I then looked down and saw that my knee had been scraped and it was a little bloody, and my leg has a cut on it too. My knee stings REALLY bad and my shoulder hurts but other than that I guess I'm okay. Should I still go to the doctor?