Generally, about 35 days of pregnancy can be measured with a pregnancy test stick. Women with regular menstrual cycles need to be alert to pregnancy when menstruation is delayed.

It is suggested that morning urine test should be carried out when menstruation is delayed for about one week. Weak positive or positive suggests that pregnancy is possible, and the diagnosis should be made in combination with blood hCG. If menstruation is more than one week in advance, the detection time will be advanced, and if menstruation is delayed for more than one week, the detection time will be extended.