If you want to see an evap, go to the Pregnancy test gallery and look atthe thread
BFN's I put in some really good evaps. My evaps popped up after about 20 minutes, looked kinda grey (not pink, like they are supposed to) and then disappeared after 5minutes.
You can get a
BFP with a faint line, but it looks like the darker the line gets, the more
HCG you have in your system (which should be doubling every 2 days after implantation.)