If a pregnancy test is out of date, it will definitely be inaccurate, as the reagents and chemicals contained in it will change relatively, so such expired test strips should not be used again to avoid delaying the result of early pregnancy diagnosis. In addition, it is recommended to buy new test strips for pregnancy testing, and it is best to use morning urine for early pregnancy testing after 35 days of menopause, as the positive rate will be higher if you are pregnant. As the number of days of pregnancy progresses, for example, it is now about 45 days after menopause, and the concentration of HCG in the urine is basically the same whether it is morning urine or urine from other times, a positive result may occur if pregnancy is detected with urine from any time, and it is important to see if the package is broken before testing with the test strips, as it may not be detected if the package is contaminated with chemicals.