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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.
A pregnancy ultrasound may be done during the first 12 weeks of pregnancy to: 1  Confirm a normal pregnancy. 2  Determine the baby's age.  Look for problems, such as ectopic pregnancies or the chances for a miscarriage.