Opened tests & evap lines, does this happen to every test that gets opened?

[ohblahdeeohblahdahlifegoeson]

I'm a shocker for opening up a test (CB or FRER) after about 10 mins if a positive line doesn't show up.
I like to peer at them at different angles
My question is...
Will a faint positive line nearly always show up (with color) when a test is opened?

Hoping that someone else does similar and can share their experience with me, if they get a faint line or not.

I frequently have this happen to me and I'm unsure if these tests are still an absolute NOT pregnant or if it means I'm frequently catching the beginning of a chemical pregnancy just before my period arrives.
If it's the latter I am ok with that as it means Im conceiving quite easily which I take as a positive sign.

Photo for example.
The FRER was yesterdays and the line appeared once the test dried and is definitely pink.
The CB is from this morning and again the line is blue but very hard to capture in the photo.
My period also arrived this morning so I know I'm not pregnant now but I wonder if I was a few days away from a true positive or not.