Evap lines

maricela

can somebody give more info on evap lines please

yesterday at night I took a test and it was negative so I just slip on my bag on the morning there's was a faint line so I decidedto take another one and negative so it passes 15 to 20 min or so and I look at it again there's a faith line too

I when ahead and ask a friend and she confirm me that there's evap lines couldn't somebody inform me more thank you in advance