Issues with FRER

Towanda • Mama of 2 earth side and 2 angels

FF identified ovulation. And I’ve been able to get positives on any FRER test, but no others. I also took a test today and still received a faint line, showed up right away. BUT my blood test showed 2.39mIU/mL, indicating no pregnancy. I think it’s a chemical, but why on earth would I be receiving positives if my HCG is so low?