The test paper is inaccurate, mental factors or irregular lifestyle, biochemical pregnancy, etc., can cause the situation that the pregnancy is detected and lost on the next day, which needs to be combined with the user’s specific signs and test results to determine the cause and deal with it specifically. 1, the early pregnancy test paper is inaccurate: the test paper is not qualified, the quality is not up to standard, so that the results appear false positive or false negative. It is recommended to check the blood chorionic gonadotropin and vaginal ultrasound at the hospital for further diagnosis and to confirm whether it is pregnancy; 2. mental factors or irregular life routine: the user is affected by mental factors or irregular life routine to the hypothalamus, which sends instructions to the pituitary gland, which then sends instructions to the ovaries to inhibit ovulation, resulting in delayed menstruation, nausea It is recommended to take blood test for HCG level in time, and at the same time, adjust the mentality, improve the lifestyle and prepare for pregnancy healthily. 3. Biochemical pregnancy: the patient’s HCG can appear elevated, so pregnancy can be detected, but the fertilized egg does not successfully implant, resulting in a negative result when retesting. It should be noted that when women of childbearing age use early pregnancy test or pregnancy test, the results vary according to their menstrual cycle and time of intercourse, and those who are highly suspicious of pregnancy can have their blood HCG tested to clarify whether they are pregnant.