The ordinary pregnancy test stick itself has transparent marks, mainly in the contact area between the urine test strip area and the urine, and the principle of the pregnancy test stick is to detect the HCG level in the urine. When a woman is pregnant, the HCG level in her urine will increase and the pregnancy test can detect whether she is pregnant. If two lines of the same color appear, pregnancy is indicated, and if one line appears, pregnancy is not indicated. It is also recommended that if you have a history of menopause, for example, if you have had your period once every 30 days, it is best to use your morning urine to test around 35 days after menopause, as this will have a higher positive rate. If the number of days of pregnancy increases with time, a positive result can be detected using either morning urine or evening urine.