After a woman becomes pregnant, due to the influence of progesterone in the body, the body temperature changes in the early stages of pregnancy, then there will be a continuous high temperature state after ovulation, and will not drop to a low temperature state. This is because after pregnancy, the ovaries will secrete progesterone and estrogen, so the body’s progesterone and estrogen will always be at a high level, and in the third trimester of pregnancy, the placenta grows, will replace the endocrine function of the ovaries, and secrete a higher level of estrogen and progesterone. Therefore, the body temperature in the early stage of pregnancy will always be at a high level, because progesterone will make the basal body temperature rise 0.3 to 0.5 degrees, and women often have obvious fever symptoms after pregnancy due to the influence of progesterone. Therefore, many women are afraid of cold and heat after pregnancy, which is traditionally regarded as fetal fever, but in fact, it is the physiological changes caused by progesterone stimulation after pregnancy, so usually this time only need to increase or decrease the clothing, and let nature take its course. There is no need to take any cooling drugs, or other food to remove fetal fever to regulate, because this is a physiological state, so during pregnancy are like this. Only until the end of pregnancy, progesterone decline will the body temperature drop. Therefore, in the early stages of pregnancy, the vast majority of women will appear because of the influence of progesterone, there are obvious cold manifestations, is because of the increase in body temperature, so that the body in the environment of the temperature difference caused by the increase.