How long did it take your cycles to fully go back to normal after a D&C for miscarriage? Were yours heavier or longer than normal?

My last 2 cycles (first 2 after the procedure) happened spot on at 28 days like normal. My hcg returned fully to zero, and I confirmed ovulation with opks/bbt this cycle. I feel perfectly back to myself- no pain, cramps, discharge, etc. This past cycle was heavier with what I thought was clumps of tissue (not clots), and now some late spotting. I expected this with the first cycle after the procedure, but not the second. Any way there could be retained products this late with zero other symptoms?

Am in the process of transitioning OB’s since I had a terrible experience with the group that handled the miscarriage, and would prefer not to have to go back, especially if this is common.