7 weeks post D&C

Still getting bfp’s. I had a mmc at 8 weeks and D&C 11/20. I know my betas were high but this is dragging out forever! I went on the pill- we are going to use a donor eggs ...no period as of yet have had some minor cramping and spotting over the last few weeks. We did have unprotected sex several times before I started the pill on 12/8. I’m 43 so it’s unlikely I got pregnant again and the last blood beta I had was 2 weeks ago and it was almost 300 so I think it’s just clearing super slow. Did anyone have this experience ? Could this be the tiniest bit of retained tissue ? I feel ok. I don’t feel pregnant 🤷🏻‍♀️