When checking whether you are pregnant, blood test or ultrasound can be used, the difference is that the time period is different and the effective examination methods chosen are different, the early stage mostly choose to draw blood to measure human chorionic gonadotropin for judgment, about 35 days after menopause can choose ultrasound examination, as follows: 1. This test is sensitive and accurate, and is a common clinical test to determine pregnancy. In general, HGH can be detected in the maternal serum after 1 week of sexual intercourse, and depending on whether the result is elevated or not, pregnancy can be further determined. According to the early growth and doubling of human chorionic gonadotropin, we can initially determine whether the pregnancy is normal or not; 2. Ultrasound: generally, about 35 days after menopause, or about 20 days after intercourse, ultrasound or color ultrasound can be performed to detect the gestational sac in the uterus, and the detection rate of the gestational sac can reach 100% at 6 weeks of pregnancy, and we can clearly see the phenomenon of pregnancy in the uterus. With the growth of the gestational sac and the appearance of the fetal heart and germ, abnormalities of embryonic arrest and ectopic pregnancy can be ruled out again by ultrasound examination.