Pregnancy test

[1234n]

Is this an evaporation line or a faint positive as the line in natural light is blue

I would say that looks like a positive line. I had faint lines with my second it’s just that the time you’re testing might be quite early and the hormone or chemical the test picks up on hasn’t built up enough to produce a stronger line yet. Faint or strong lines mean the same - positive pregnancy test!
congratulations, I hope this is good news for you, take care