I need help from someone who has experienced faint lines not getting darker

Lc
I was 8dpo on Wednesday. Got a faint line on two tests, FRER. 
Yesterday I got another two faint lines.... but soooooo faint it was hard to see. 
Today it's super faint still. Not any darker and maybe even lighter. 
From your experience is this a chemical or do I sill have a chance?!? 10 dpo today 
8dpo Wednesday 
9dpo Thursday 
10 dpo Friday