I think I had a miscarriage, help?

I just found out I was pregnant yesterday. I had some light pink spotting the day before so I thought it was just implantation or just regular spotting. Today I started bleeding. Bright red blood, I had really bad cramping in my lower abdomen, back pain, and I had hella blood clots. The blood clots were just dripping out of me. I’m going to the doctor tomorrow, to find out how far along I am, but I don’t know. I still have slight cramping and am bleeding a little bit. I know I’m probably at least 2-3 weeks pregnant. I found out at the doctors bc they needed a urine sample (i have a uti) and I asked if they could take a pregnancy test, not because I was concerned but because there could be a chance and I wanted to make sure. Help??? Does this sound like a miscarriage??