You don’t need to be fasting for an ultrasound in the second trimester. If you do an abdominal ultrasound you need to hold your urine and have a full bladder to see more clearly, if you do a negative ultrasound you don’t need to hold your urine. No fasting is required for fetal ultrasound during the entire pregnancy. In mid- and late-term pregnancies, there is no need to hold urine or make any preparations. You just need to go to the obstetrics department, get an ultrasound checklist, and make an appointment to register for the examination. Because of the usual queue for registration, pregnant women are advised not to fast if there are not items that require fasting for blood tests to avoid hypoglycemia.