The early pregnancy test is used to detect whether the subject is pregnant by testing for human chorionic gonadotropin (HCG) in the urine. HCG is a hormone secreted by the chorion or placenta after pregnancy, and it usually appears in the urine a few days after pregnancy, but in very small amounts that do not increase significantly until 10-14 days after pregnancy. Therefore, you can determine if you are pregnant by testing the HCG in your urine. Generally, there are two types of early pregnancy test results, namely: a colored band only in the control area of the test strip is negative, indicating no conception; a clear colored band in both the control and test areas of the test strip is positive, indicating conception. Because of the advantages of fast, convenient, sensitive and high specificity, early pregnancy test paper is favored by women. However, women who test themselves for early pregnancy should keep in mind that the early pregnancy test can only be used as a primary screening test, and it can also occur as a false positive or false negative. Blood in urine, recent pregnancy (such as abortion, premature birth or after 8 weeks of delivery), HCG-secreting diseases such as staph, bronchial cancer, kidney cancer, ovarian tumor, and taking some fertility drugs, etc., can lead to false positives when using the early pregnancy test in these cases. It has also been reported that patients with hyperplasia of the endometrium can have a positive test for early pregnancy. Wang had taken some “fertility” supplements before. False negative pregnancy test can also occur if the purchased early pregnancy test is stored for a long time, or if the test is damp or not stored at normal room temperature (it should not be refrigerated); in the initial stage of normal pregnancy or ectopic pregnancy; after the third month of pregnancy, the HCG level decreases. In particular, it is important to note that the use of early pregnancy test strips when the HCG level is too high may result in false negatives. Women should be alert to false positive and false negative test results when using early pregnancy test strips, so as to avoid taking drugs that are not suitable for pregnant women, smoking, drinking alcohol, receiving X-ray radiation and other behaviors that may affect the embryo, which may result in miscarriage. When the test result is positive, it is also necessary to further determine, because in case of ectopic pregnancy, serious consequences such as hemorrhage and shock may occur at any time. Therefore, it is advisable for women to go to the hospital when their periods are delayed to determine if they are pregnant as well as to rule out ectopic pregnancy.