If you usually have regular menstrual cycles and do not use reliable contraceptive methods during intercourse, you can use a pregnancy test after a week of delayed menstruation to check if you are pregnant. The method is to use the morning urine, put the end of the pregnancy test with the indicator line into the morning urine for 3-5 seconds, then place the paper flat and look at the result within 5 minutes, if both red lines appear deep, consider it pregnant. If there is one dark line and one light line, it is a weak positive and should not be judged as pregnancy, but should be rechecked every 2-3 days. If one red line is negative, pregnancy can be basically ruled out. You should pay attention to the following situations when applying pregnancy test: First, you should wait until your period is postponed for one week or 20 days after intercourse to check again, so that the accuracy rate will be higher. Second, the application of pregnancy test paper should be standardized and the quality of the paper should be reliable.