If two bars appear when a pregnancy test is used incorrectly, it is recommended to change the test and retest. This is because two bars may mean that a woman is pregnant. A pregnancy test is a test that detects the level of HCG in the urine to show whether or not a woman is pregnant. When a woman is pregnant, the HCG level doubles due to the secretion of HCG by trophoblast cells, which can be detected by urine. It is recommended to use the pregnancy test in strict accordance with the instructions and to choose the interrupted urine of the woman’s morning urine, so that the test is more accurate. If the pregnancy test still shows two bars after changing the pregnancy test, it is also possible to clarify whether you are pregnant through ultrasound or blood tests at the hospital. It is recommended that women in the first trimester of pregnancy take folic acid tablets under the guidance of a doctor to prevent fetal malformations and to do pre-pregnancy tests to observe the development of the fetus.