What's going on - 3 weeks after D & C

Had a d & c 3 weeks ago, at 9 weeks hcg was high at 41,000. So I assume it will take me a long time to get a period again and/or ovulate. I stopped bleeding about a week ago, and same with cramping. So today I was actually spotting a fair amount of brown & my cramps are back & bad! I took an ovulation test but I really don't think it's likely or possible because I took a left over hcg last week & it was still a really strong positive. 🤷🏼‍♀️

Any advice or words from experience please ladies thank you