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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.
an ultrasound is usually performed between 18 - 24 weeks to determine the sex (if you want to know) and health of the baby. so..if the baby is in the right position, your ultrasound tech or ob/gyn should be able to tell! good luck!!