Advice needed: Clots passed at 6-7 weeks

First test was a very faint line, second was slightly darker, and it was at around 2 weeks after when the period should have come that the test showed a clearly darker line.

After this it was all good although symptoms varied, had nausea in the week of the test then no nausea after a week.

Then this week there was some very light pink spotting. Then that evening it was dark red goo coming out and some clots (smaller than hand).

Then the next day a clot the size of 3 inches or so was passed. The clinic did a HCG check and it was 190 which seems very low at what should be the 6th or 7th week.

We’re almost sure it’s a miscarriage but it’s really really unclear. 2nd HCG check given today and waiting for results.

Has anyone had a similar experience?