How often do get an evap line on $ tree tests after the reading time?

Kim • ❤️🧡💛💚💙💜 Mom of 2 angels praying for our rainbow baby💜💙💚💛🧡❤️
I know that you are not supposed to look at a test after the recommended reading time, but it caught my eye from the trash can. I've been testing for a couple years now and I don't typically notice evap lines on $ tree tests especially pink lines, but I did today two hours later. Is this really common? Has anyone gotten a bfp after an evap line? 
3 minutes
2 hours 

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