It is possible to lose weight in early pregnancy. Most women in early pregnancy will have early pregnancy reactions such as anorexia, nausea and vomiting, which make women lose their appetite, eat less and drink less water, and may have no weight gain or loss. During this period, women are affected by the increase of estrogen and progesterone and HCG in the body, and the severity of the early pregnancy reaction is related to the individual’s physical condition and the value of the increase of hormone level. Women with heavy early pregnancy reaction will be thinner than before, so they should relax and balance their mind, eat less and more meals to ensure the supply of nutrition, and do not eat spicy, cold and stimulating food. After two weeks, most of the early pregnancy reactions will be reduced or disappear, and the weight gain will be steady.