So, it's been about 2 hours since I took the tests (I took both from the package) and they both had that faint positive. Going back and looking at them, the second (vertical) line is almost gone entirely. Is it safe to assume that means it WASN'T just an evap line?
I've been reading that the brand I used is notorious for false positives (wow, wish I had known that first!), so I am going to get a digital test tomorrow!