Line appeared ?!

Kyla

So I took this test this morning, waited 3 mins didn’t see a second line and put it down and went about my day and ran some errands. Came home and looked at it and boom there’s a second line now. I know your not supposed to look at it past the time it says, but I guess I’m just curious because its blue and I always thought it would be a colorless evap line. So if any of you ladies have experience with this happening I’d greatly appreciate advice.