faint line or evap line....

Rebecca • Beautiful baby girl born 12th September 2018 - love my little family 👨‍👩‍👧🐶

I don't have a picture of it because I disregarded it as an evap line straight away... but I took a test last week and within 3 mins I thought I could see a vvvvvfl same width as the control line, but it was also darker to one side of the line. would like to note it was blue not grey. after reading LOTS of posts, I've now seen that evap lines tend to appear after a while and are usually grey. can evap lines come up that quick?? and on the flip side could it have been a positive test even though it was only darker on one side?? visually if just wait til the morning to test but now I'm say in work after the lunch rush staring at my computer and can't help but wonder!! please help!!