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Most ultrasound exams require no preparation, with a few exceptions: 1  For some ultrasound exams, such as of the gallbladder, your doctor may ask that you not eat or drink for up to 6 hours before the exam.
Q: A: My first ultrasound was 7 1/2 weeks. It is usually at your first appt so you can get your due date. Usually between 7 and 10 weeks.For finding out the sex of the baby, it is usally scheduled around 17-20 weeks.