Ttc after d&c

I Believe 🌈

Had d&c on 5th Feb. my periods havent returned. I am doing the home hcg as well as opk test. Hcg test is continuously coming back invalid (pink strip) and opk test (purple strip) shows a very faint control line and a darker test line attached.

Please help with reading this, I dont want to miss any window. What is the possibility of hcg still being above 25?