Will levoxyl cause a false positive pregnancy test is I just started taking it 5 days ago?

There is no evidence to suggest that levothyroxine, sold under the brand name Levoxyl among others, can cause a false positive on a pregnancy test. Levothyroxine is used to treat hypothyroidism (low thyroid levels) and certain kinds of goiters. Pregnancy tests work by detecting human chorionic gonadotropin (hCG), a hormone present in high levels during pregnancy. Levothyroxine does not alter the production or detection of hCG. If you have reason to suspect a false positive, consult with a healthcare professional who can confirm it through additional testing. Consider a confirmatory pregnancy test with a lab-grade test or consult a doctor to evaluate the results more accurately.