Emotional fluctuations in pregnancy will affect the growth and development of the fetus, and in serious cases, it will also lead to miscarriage, preterm delivery and other adverse consequences. When pregnant emotional excitement, the body’s adrenal hormone secretion increases, blood flow accelerates, the body’s oxygen consumption increases, resulting in a relative decrease in the amount of blood normally supplied to the umbilical cord, affecting the umbilical cord’s blood supply, resulting in transient hypoxia of the fetus. When you are emotionally depressed and irritable during pregnancy, hormone secretion in the body will be disrupted, affecting the development of the fetus. If your mood fluctuates a lot when you are pregnant, it is also easy to cause uterine contractions, resulting in frequent fetal movements, and in severe cases, it can also lead to miscarriage or preterm delivery. Therefore, it is important to stay happy and control your emotions during pregnancy. If you feel uncomfortable, go to the hospital in time for reasonable treatment.