It is recommended that the following three methods can be used to detect pregnancy: First, the simplest method is to use early pregnancy test paper or pregnancy test stick to detect the concentration of HCG in urine, and it is generally recommended to use morning urine for the highest accuracy. Secondly, the most accurate way is to take a blood test for HCG, which is a protein hormone secreted by the placenta starting after the fertilized egg has been laid. It can be detected on the 8th day after fertilization. The most accurate and direct way to detect pregnancy is by drawing blood for HCG. Third, you can also have a gynecological ultrasound to detect if you are pregnant when your period is delayed for more than 13 days. Normal pregnancy at 13 days of delayed menstruation can be detected by ultrasound to see the location of the gestational sac. Generally, vaginal ultrasound is relatively more accurate than abdominal ultrasound. If the gestational sac is seen in the uterine cavity, the yolk sac is seen, and even the primitive heart tube is seen pulsating, it can be clearly identified as a live intrauterine embryo.