The process of physical changes in pregnancy is usually as follows: 1. The level of hormones in the body starts to increase in early pregnancy, especially the level of estrogen increases more, and in early pregnancy, under the influence of hormone levels, there will be water and sodium retention, such as edema in the gastric mucosa, which will lead to nausea, vomiting and anorexia in patients as the pregnancy month increases; 2. When the placenta is formed, it is produced by the placenta Hormones, so that the pregnant woman’s body systems will undergo some corresponding physiological changes, first of all, the uterus begins to increase in size, and blood volume also begins to increase. The blood volume starts to increase from the 6th to the 8th week of pregnancy and reaches a peak at the 32nd to the 34th week of pregnancy, generally increasing by about 45%, with an average increase of about 1500 ml. The composition of the blood also changes, for example, the number of red blood cells decreases due to the increase in the plasma component, so the patient may experience physiological anemia. The burden on the heart will also increase, so the heart rate will increase by 10-15 beats per minute, and there will also be changes in blood pressure.