3 days late, Evap line or positive?

[CLW85]

Hiya ladies!
I am so confused and literally driving myself nuts at these tests! Not even spoken to my husband yet as want to be sure.
ive done 3 tests now over the past week and they all have the same thin blue line. I read that likely evaporation lines but they are usually grey or colourless whereas mine is a definite blue and getting darker in colour but not thickness. I had very pale pink discharge about 2 weeks ago which now I am thinking may have been transplantation bleeding and I am 3 days late on my period that is usually so regular. I am also just turned 40 and already have 4 children so this will be a shock if turns out to be positive I just wanted some fresh eyes and input on my test taken about 2hours ago.

I would take that as evap. The line should be wide if it was a positive.

Sorry but could it be a chemical?

I think I can see the full thickness line actually… but it should be a lot more obvious by now if you’ve been testing for a week. You could try a pink dye test to double check.