Ultrasound is accurate in detecting fetal heartbeat and buds, and can also give a general idea of the length of the pregnancy based on the size of the embryo. Ultrasound, also known as B-mode ultrasound, is a non-surgical diagnostic test. In the early stages of pregnancy, ultrasound can be used to determine whether the pregnancy is intrauterine or ectopic, and to observe the growth and development of the embryo and fetus, as well as the fetal heart and buds. In mid-pregnancy, especially around the 24th week of pregnancy, ultrasound can be performed to detect malformations, and to detect whether the development of fetal organs and systems in the uterine cavity is normal, and so on. In general, ultrasound examination of fetal heart and buds is still relatively accurate, and can also be based on the size of the embryo to understand the duration of the pregnancy, etc. In addition, for gynecology, the clinic often uses ultrasound to determine whether there are lesions in women’s uterus, ovaries and fallopian tubes, and can observe whether there are uterine fibroids, endometrial polyps, cervical tumors and other conditions.