Ultrasound is a more common pregnancy test that allows you to directly observe the development of the fetus. It is not necessary to fast for pregnant women to have an ultrasound because it is not necessary to check the digestive system of pregnant women, so eating will not affect the results of the examination. Pregnant women need to pay attention to the following matters: 1. Pregnant women need to hold urine for ultrasound examination in early pregnancy, in order to visually observe the inside of the uterus and to prevent intestinal gas from interfering with the examination; 2. Pregnant women should stay relaxed during ultrasound examination, and overly tense muscles may affect the position of the uterus and the fetus, resulting in certain deviations in the examination results; 3. Emotionally stable, to avoid rapid heartbeat leading to fetal agitation, which may easily affect the examination results.