I think I am crazy...

Mommy of 2

So I have taken a test this morning and it’s shows a slight faint line... but it gets darker as time goes on. Is this a evap line or could it be the start of a positive... I will be testing in a few more days but just curious. If you can’t see it, that’s fine not really asking about that just wanted to see who else has been through it. And what the outcome was. Thank you.