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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.
In the first trimester of pregnancy (weeks one to 12), ultrasounds may be done to: 1  confirm pregnancy. 2  check the fetal heartbeat. 3  determine the gestational age of the baby and estimate a due date.n ultrasound can be used for a variety of reasons during pregnancy, depending on the stage in which it is done. Your doctor may order more ultrasounds if he or she detected a problem in a previous ultrasound or blood test.