If the patient usually has regular menstruation, with a menstrual cycle of about 30 days, and no ovulation disorders occur in this pregnancy, the ultrasound at about 50 days of pregnancy will suggest the following: first, the presence of a gestational sac can be seen in the uterine cavity, with a size of about 3.0 cm. At this time, the yolk sac can be seen and the primitive heart tube can be seen pulsating, but it can also be absent. Since the heart tube pulsation will appear within about 6-8 weeks after the patient becomes pregnant, it is possible to have a fetal heartbeat within 56 days. Secondly, if there is no primitive heartbeat in this examination, it is necessary to repeat the examination after about one week, while the ultrasound will indicate that there are no abnormalities in the patient’s ovaries bilaterally and no significant abnormalities in the body of the uterus or the patient’s cervix. If the patient is 50 days pregnant and the ultrasound indicates the above, it is normal. Thirdly, if the patient usually has irregular menstruation, this ovulation disorder occurs. At this time, in addition to the usual hints, the ultrasound suggests that the size of the gestational sac may not correspond to the month of menopause and requires dynamic observation.