Evap line???

Hi everyone! I’m hoping to get some advice, I’m around 7dpo, super impatient so I took a test this morning, I thought it had the faintest line but I feel like I was just imagining it, and then I looked again shortly after and there was this really thin line which I’m thinking is an evap line. I haven’t always heard great things about blue dye tests, hoping to get your opinions on them. Thanks so much xx