Are first response test reliable?

Are they known for having indents

I’m 9dpo

I used my last pink dye test and got a vvvvvfl and im not sure if it was an indent

Just took a first response thinking it might show a clearly positive or negative but again I’m just seeing a reallllyyyyyyyyyy faint positive or an indent

And now I don’t know if I’m just imagining it all 🤦🏻‍♀️

I can’t get a decent picture either