The most obvious clinical symptom in the first trimester of pregnancy is pregnancy reaction, which may occur as nausea, vomiting, loss of appetite, or acid reflux, weakness and drowsiness, and is inevitably related to the hormone secretion in the body. During this period, you should pay attention to keep your mood relaxed, do not have too much stress, pay attention to develop good habits, try to eat more fresh fruits and vegetables, which have the effect of strengthening the spleen and appetite, and can also avoid the aggravation of pregnancy reaction, do not eat too greasy, poorly digested food, to avoid aggravating the burden of the stomach, aggravating the symptoms of nausea and vomiting. In the first trimester, because the fetus has not yet fully developed and formed, the growth rate is not particularly obvious, the uterus will not have a significant protrusion, and the enlarged abdomen is not visible from the surface.