What does this faint positive mean 7 weeks post D&C?

So a little back story, I had my D&C on 2/1/2022 at 12 weeks, then I went to the hospital on 2/13/2022 due to passing large clot. At the ER visit on 2/13/2022 they tested my HCG level via blood work. I had 20miu in my blood. Then I had my first period that started on 3/7/2022. According to my glow I’m expected to ovulate tomorrow…. I decided to go and buy FRER and ovulation test today to see if I’m ovulating tomorrow for sure. I took this picture of my FRER it does have color in person. I’m not sure what this means? Do I still have HCG in my body? First picture is my FRER taken within time frame and 2nd is ovulation.