Evap line or no

ray

I decided to test early cause I couldn’t wait any longer my period suppose to start next week. But I been having weird feelings so I been testing. Ok Ik it says discard after 10 mins but I looked again after a couple hours and this appeared!! I then dig through the trash for the one I took 4 days prior and it didn’t have one nor did it have one when I checked it a couple hours later when it took that one.