Faint or evaporation line?

Tessa

I took 2 pics. 1st pic not edited but I saw a faint line. 2nd pic I adjusted the color and I can see a more of the line. I am new to this but have been reading a lot of the post. Today I am 1 day late. I’ve never had a baby so if anyone knows what this means or suggest I do something different it would really help.