Have you had evap lines on the walmart/first signal pregnancy tests?

I have NEVER gotten an evap line on these tests. After testing this morning i went to make some toast and get some yogurt. Well i forgot about the test untill i think it was about 10 min after i had taken it. When i went back there was a line.. If you had what you thought was a evap but ended up pregnant? Honestly dont know if its an evap but ive never had one. I believe time limit for this test is 10 minutes..

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