Do you think I miscarried?

I got a positive test on Friday but started to bleed on Saturday. On the saturday I had awful cramping and passed what looked like lining, there was no grey tissue though. The entire time the blood was bright red and there were no other clots. The bleeding is almost completely gone now after 3-4 days but I’m still having some cramping, and I tested this morning and there was barely a line. I’m so disappointed at myself. Do you think I miscarried?