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1 Other ultrasound exams, such as of the pelvis, may require a full bladder, so your doctor might ask you to drink up to six glasses of water two hours before the exam and not urinate until the exam is completed.
Bear in mind that you may need a second ultrasound before you know for certain if all is well. If you are unsure of the first day of your last period you will be offered a dating ultrasound when you are between 10 and 14 weeks pregnant (SOGC 2003) . The main reason for the ultrasound is to work out how many weeks pregnant you are, and to estimate your due date.