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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.
I have never heard that you mustn't eat prior to a pregnancy ultrasound and certainly the website makes no mention of it. If an early ultrasound is being performed the bladder should be full to enable the uterus to be seen more clearly, but other than this no regimen is necessary. ****I am not the person(s) or related to the person(s) who answered the first two paragraphs. Not every abdominal ultrasound is for pregnancies - there are many other reasons.