I had my period 2 weeks early and it was really heavy with blood clots and my lower abnomin has sharp pains and my back has been hurting bad. I don't know what's wrong.
I went to the docter, and he said that I might be pregnant, but he isn't sure. I have an ultrasound Friday.

You could have had a miscarriage. Friday is only a day away, so don't stress until you get the results.