Elevated body temperature in pregnant women usually lasts for about 12 weeks. There is a certain range of elevated body temperature in pregnant women, which is 0.3-0.5℃ higher than the basal body temperature, and the body temperature lasts between 36.9-37.2℃. Generally speaking, as long as the body temperature does not exceed 37.2℃, it is a normal physiological reaction and there is no need to worry too much, and it will improve when it lasts until about 12 weeks. If the temperature exceeds 37.5 ℃ is not normal, belongs to the phenomenon of low fever, need to check the inflammatory indicators, such as C-reactive protein, calcitonin and blood routine, etc., in order to assess whether there is a manifestation of inflammation. At the same time, it is also necessary to monitor the changes in HCG, progesterone and ultrasound, to check the development of the fetus, to find out the cause of the increase in body temperature, targeted treatment, to reduce the impact on the fetus. Try not to stay up late at the beginning of pregnancy, pay attention to rest, develop good habits of work and rest, try not to eat spicy, stimulating, cold food, etc., do not come into contact with toxic substances, timely supplementation of folic acid tablets and vitamins.