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No, thyroid issues don't cause false pregnancy tests.
False-positive test results can occur due to:
1.Errors of test application
2.Use of drugs containing the hCG molecule
3. Medications like chlorpromazine, phenothiazines and methadone.
4. Liver diseases, cancers like choriocarcinoma.
So, if you had an unprotected sexual intercourse, and have missed your periods, and also the pregnancy test done at home is also positive, then most probably you are pregnant.
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