Is this a line ? Or an evap ?

Salayah

Okay so this picture was taken at 9dpo, then 10dpo took another one in the morning still faint, but when I took it in the afternoon it was negative. I’m 12dpo and I saw a vvvfl this morning and now nothing . I’m just confused because I thought the line was supposed to get darker ? Please, I’m about to lose my mind lol 😕