Could i have gotten a false negative?

Question

Im a few days late on my period so i decided to test. In the cup used to be detergent and im pretty sure i didnt wash all of it completely out as i was in a rush. Could this have gotten me a false negative on this test?

Answer

Anything other than urine could affect your reading so it's possible your test is incorrect

Answer

Don't drink anything before and use first morning urine.

Answer

Take another test??

Answer

I also drank about a bit more than a cup (standard measurement wise) of tea right before taking the test.

Could i have gotten a false negative?

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