4 days consecutive evaporation???

Erna

Hi ladies, the first pic taken at 10 dpo, it looks a like vvvfl there.. and it appear within 5mins..

At 11 dpo, the faint line appear within 3 mins ( I dunno or maybe just only my eyes can see those fl😅)

The line not getting dark from 9 to 12 dpo.. is it evaporation line? Or maybe chemical preg??