Is it necessary to make an appointment in advance for a 4D ultrasound during pregnancy?

Patient's question:

Pregnancy check

Doctor's answer:

If you are pregnant, you need to make an appointment. If the appointment wait time is long, you can wait until half a month later. Generally, you cannot make an appointment online. You can first ask the family member to make an appointment to see if you can be scheduled for a date, and then the pregnant person can go there. It's too crowded and chaotic, and it's easy for pregnant women to get upset.