Ept brand pregnancy test help please


So I’ve been using first response and getting faint lines some darker some lighter and this am they were so light I am getting really frustrated.

So I bought a pack of blue dye ept i took one and right away I saw a line but it was really faint. Well after it sat it got a lot darker. I need some advice on anyone who has used these. Could this be an evap?

The first pic was at 3 minutes the second was after it sat for a bit