I’ve taken about 10 tests recently (as you do). The clear blue ones (I know they’re terrible now), all three had a thin blue line and some said it was evap which I thought too. The pink dye ones I’ve taken, they didn’t seem to have anything appear. I took a pink dye one this evening (a cheap Sainsbury’s one), and within the time frame I could see a super faint line when I tilted it to the light. I can still see it now when I turn my flash on, but it’s not very visible. Do evap lines only appear outside the time frame or can they appear in the time frame too?