After the injection of HCG through the early pregnancy test paper test is prone to double bars, also known as false positives, you need to distinguish the clinical significance of the test depending on the time of the test. Whether or not two lines appear on a pregnancy test is determined by the presence of HCG, or human chorionic gonadotropin, in the woman’s body. After using the HCG method to promote ovulation, women are very likely to show two lines, or double bars, when taking an early pregnancy test within one week, mainly because the HCG in the body has not been metabolized, and the appearance of a double bar on an early pregnancy test within one week cannot be used as a basis for determining whether or not a woman is pregnant. In order to ensure the accuracy of the test when playing HCG, need to be more than two weeks after intercourse, to the hospital blood test can determine whether the pregnancy accuracy is higher.