Hcg levels at miscarriage

Ca

I just found out today that my hcg level on the day of my D&C; was 805,500. Which is extremely high for a 12 week pregnancy even. Anyone else have this experience?? Did you ever learn why?

From my research it seems it can be a sign of various trisomies.

(Blissfully my levels are already down to 14,000 a week later.)