Try using SMU instead of FMU if you can

I did googling and found that SMU can be better than FMU

I took a test on 9 dpo using FMU and SWORE I saw the faintest line, I tested again on a 3 hour hold without drinking or eating anything and the result was so much more obvious

See below

FMU - you can kind of BARELY see a shadow that most people would assume is a complete negative or an indent

SMU (also 9 dpo) - clear faint line

I tested again on 10 dpo, skipping FMU and doing SMU on a 3 hour hold and it was clearly positive