Early pregnancy reactions are a normal physiological phenomenon. However, the shorter the duration of pregnancy, the milder the symptoms of early pregnancy reaction. In the first week of pregnancy, most patients will not experience abdominal rise. As the pregnancy progresses, the uterus gradually increases in size and some patients will experience mild abdominal distension while the uterus undergoes adaptive changes. However, this kind of bloating symptoms are light and short-lived, which are physiological changes, therefore, pregnant women do not need to be overly alarmed when mild bloating occurs. However, if the degree of abdominal distension is heavy or accompanied by abdominal pain, then the pregnant woman needs to pay attention to it. If necessary, a gynecological ultrasound should be performed at a local hospital to clarify the development of the embryo. In addition, the presence of abdominal distension should also be noted as one of the typical symptoms when a patient has a digestive system disease. Therefore, if necessary, it is necessary to consult a gastroenterologist to exclude the possibility of organic lesions of the digestive system. Therefore, most patients do not experience abdominal distension during the first week of pregnancy, but they need to be observed for changes in abdominal distension symptoms.