Can there be an evap line if the sample area is still wet?

Annie
I took this and thought I possibly saw the faintest line at around 1 - 2 minutes but needed to leave the room to stop myself from obsessing...this photo is a little over 10 minutes later...is there a chance it's an evap line? Is there even a line?? I feel like I'm going crazy with these lines over the last few months :P