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If you're asking how it detects pregnancy, it does so by having a chemical dye that reacts with the hormones that are present when pregnant.

If you're asking how it gives a negative result and then later gives a positive result, that is due to the test chemicals reacting differently with time. After a certain amount of time has passed (3-5 minutes, read the directions), the test is no longer good and any results should be discarded. Any questions, get another test.

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Q: Can a clear blue go from not pregnant to pregnant?
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