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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.
There are two ways of doing an ultrasound scan. In early pregnancy, especially before 11 weeks, it is usual to have a trans-vaginal (internal) scan, where a probe is placed in the vagina. This gives the clearest and most accurate picture in early pregnancy. It may also be offered after 11 or 12 weeks if a trans-abdominal scan doesnât give a clear enough picture. From 11 or 12 weeks, including at the routine booking-in scan, it is more common to have a trans-abdominal scan.