Can FRER give a false NEGATIVE ?

Tonya

I took a test Friday and it was a vvvvVFL and then Sunday and it was pink and way more noticeable. Today I took one thinking it will be darker and it is almost surely negative with a shadow of a line. I know I have to wait for AF and yes I know it could be a chemical but I just wondered if FRER could give a false neg?

This one was Sunday and showing lots of pink

This one is this morning (Tuesday)