Evap line?

Took this test last night and it was faintly positive after 2 min. I got super excited and couldn't sleep. This morning I took another and it was negative. Then took another...again negative. I finally went and bought a clear blue digital and it said negative too...nothing like getting a faint positive after trying to conceive for over a year (following a miscarriage) and then getting smacked back in the face with a no.
Is this what they call an Evap line...even though it showed right away? Or maybe I just had a bad test...