Usually, tests from well-known companies and proper diagnostics give correct results. Errors for the most part are not related to their quality, but to various difficult-to-measure circumstances. For example, a false positive result may result from taking hormonal drugs during the test or due to some health problems in a woman, against which the synthesis of hCG in the body may increase. It also happens vice versa. For example, due to kidney disease, the level of hCG in the urine may decrease, and the result will be a false negative.
Remember that only a qualified specialist can accurately confirm or deny the presence of your pregnancy. After receiving the test results, it is recommended to consult a gynecologist.