Help! I had a miscarriage 3.5 weeks ago

I had a miscarriage on Dec 8th, bleed for about 2 weeks, and seemed to have passed everything. OB said if I don’t have a period in January to make an appointment but as of now she thinks everything passed normal. Well, I’ve been having some spotting when I wipe, and have had it for about 4 days. Some slight cramping here and there, nothing horrible, I don’t even need ibuprofen for it: Is this normal? What could it be? I’m also still getting positive pregnancy tests. But they get lighter each week when I take one.

I miscarried around 8 weeks according to last period, I was measuring 6 weeks on the ultrasound that I had 2 days before I miscarried. Levels were 23,000 day of miscarriage