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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.
How many ultrasound exams will I have during my pregnancy? You should have at least one standard exam during your pregnancy, which usually is performed at 18â22 weeks of pregnancy. Some women may have an ultrasound exam in the first trimester of pregnancy. A first-trimester ultrasound exam is not standard because it is too early to see many of the fetusâs limbs and organs in detail. An ultrasound exam done this early is used to do the following: Estimate gestational age.