In general it is not necessary to come with an empty bladder to the ultrasound examinations during pregnancy, because the urinary bladder’s content does not affect the examination. However, the ultrasound examination during the 12th – 13th week in the first trimester forms an exception to this rule. In this case the most ideal situation in most cases is to have a half-full bladder. How well the ultrasound exam allows the doctor to see depends on numerous factors though, such as the form of the uterus, the position of the placenta and the fetus, possibly existing uterine fibroids, abdominal wall thickness, potential scars on the abdominal wall due to previous surgery, etc. Thus, sometimes it becomes clear only during the examination, if a full or empty bladder provides a better view. Considering the fact that it is much faster to empty the bladder than to fill it up, we recommend you to come to the examination with a half-full baldder.