Miscarriage?

My period was only about 3 days late so I never took a test but when I finally got it, I bled heavily and the second day 3 big lumps came out and they were irregularly big. I would say the first one was about the size of 2 quarters.

The second one had white stuff. It’s been about a week and I still feel heavy cramping even though my “period” only lasted 3 days. Could this have been an early miscarriage??