Generally, pregnancy can be detected by early pregnancy test strips around 30-37 days after menopause, depending on the regularity of menstruation. Early pregnancy test strips mainly detect the level of human chorionic gonadotropin in the urine of pregnant women to diagnose whether they are pregnant or not. Under normal circumstances, the fertilized egg will start to lay about 7 days after intercourse during ovulation, and the chorionic gonadotropin in the blood will start to rise at that time, but it cannot be detected by the early pregnancy test yet. About 1 week after the fertilized egg has completed implantation, the chorionic gonadotropin in the urine will begin to rise and pregnancy can then be detected with the early pregnancy test strip. Therefore, in women with regular menstrual cycles who are pregnant, pregnancy can be detected with an early pregnancy test strip about 1 week after the menstrual period is pushed back. In the case of women with irregular menstrual cycles, pregnancy can usually be detected with an early pregnancy test about 16 days after the last intercourse. In addition, it is recommended to choose morning urine for testing when using the morning pregnancy test.