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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.
Most doctors only schedule one ultrasound (16-22 weeks) unless there is a problem or history of problems. To answer the question &quot;When is the best time to get an ultrasound,&quot; 20-22 weeks is the best time to diagnose serious problems. If you do it any sooner, you may miss problems that haven't developed yet.