Feeling tired at the beginning of pregnancy may be related to the change of hormone levels in the body after pregnancy and the increase of body weight. 1. Increased body weight: After pregnancy, with the gradual development of the fetus, the pregnant woman’s body weight will gradually increase and the nutritional needs of the fetus gradually increase, so in the early stages of pregnancy will feel very tired, is a normal phenomenon, generally do not have to worry too much. 2. Changes in hormone levels in the body: After pregnancy, the hormone levels in the body will change or disorders, causing pregnant women to experience early pregnancy reactions or mood changes, may also cause pregnant women to feel very tired in the early stages of pregnancy. It should be noted that in the early stages of pregnancy, pregnant women should rest more, maintain sufficient sleep and not too tired.