yeah it's evaporation unfortunately, the same happened to me last week with the same test x
If it didn’t show this line in the timeframe then it’s an evap
Id retest
Negative tests don’t usually turn this positive later on, that’s just not really how they work. I agree you can’t trust this test now after leaving it but I would be shocked if you weren’t actually pregnant so test again and just read and follow the directions carefully for your own peace of mind. As you know even a very faint line is still a line! Good luck!
Retest
I’d retest but when hcg is so little it can take longer to develop a line. I took 3 test . These were pink I left them for about an hour . Then I seen a line develop. I was definitely pregnant
Since it's been a day then it's an evap, sometimes they have color. You can retest in a couple days or make an appointment but I don't think it's positive, you're not supposed to look at tests or trust any lines that show up after the 10 minute mark