Evap FRER?

Has anyone gotten evaps on FRER test? I tested on a pregnancy strip and I saw a shadow. I took a FRER yesterday and I saw a line within the time limit but it was colorless. Today, I took another FRER and I see an extremely faint line. Sometimes I think I can see pink, other times I think it’s colorless. Clearblue was a stark negative. Could it be the beginning of something or a chemical pregnancy? Or residual HCG from my miscarriage in July? So confused. And mostly just sad. My period is due in 3 days.