I thought I seen a line forming and took it out of the case to see it better.. thanks for your response:)
I've heard taking it out of the case can make a line form when its a negative making it looks positive. How many dpo are you?
No. Blue dye tests will always have a line when taken out of the test. Too much oxygen causes evaps. Positives on evaps start dark on one side and light on the opposite.