Evap or positive?

Hannah

I took a test yesterday and just after the time limit a thin but dark positive line turned up (I’ve never had an evap before and I’ve taken a few tests with this brand)

Then retook another one at 9.30pm and it was a straight negative.

Took another one early this morning and the same thing happened like the first - any one had anything similar happen?

I have ordered some pink dye tests but just want to see what others think.