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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.
Early ultrasound. If you've experienced problems, such as a previous miscarriage or bleeding in the first weeks of this pregnancy, your doctor or midwife may recommend an early ultrasound. This takes place when you're between six weeks and 10 weeks pregnant.irst trimester combined screening. At the same time, as your dating ultrasound, you will be offered combined screening, to check for abnormalities. This is made up of: If you turn out to be less than 11 weeks pregnant when you have your dating ultrasound you will need to rebook for your combined screening.