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False Negative Pregnancy Test: what can cause false negative

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What are the chances of taking two pregnancy test that come out postive but not being pregnant? I know they say some things may mess up the test but is pcos one of them? I took the first test seven days prior to the day my period was due, and the second one five days before. Thanks

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replied October 25th, 2006
Early Pregnancy Signs and Symptoms Answer A1690
In normal circumstances, a pregnancy test result is valid if the test is taken not earlier than 5 days before the next period arrives. False positive results are possible when using home pregnancy tests (urine) in cases of increased levels of Luteinisating hormone (LH). For those experiencing PCOS, LH levels are already increased and menstrual cycles/periods are irregular so you may need to take a more specific pregnancy test. In your case, the best solution seems to be to wait until you miss the expected period and then take a blood pregnancy test (beta); it is a more specific pregnancy test. You can go to your doctor to request such a test.
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