Positive hours later?

Has anyone taken a rapid clear blue test that is negative but then leave it alone and hours later I see it shows positive blue line. How is this possible? This happened with 2 tests
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It’s pretty common. As the test dries a line becomes visible. That doesn’t make them positive, and that’s why directions give you a time limit in which to read the tests

Really common with clear blue. Exactly why you should throw them away and not look again after the testing window

Blue dyes are horrible for giving evap lines! Definitely wouldn’t take that as a positive unfortunately. Try a pink dye and checking within the time frame the test recommends x

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