The onset of fever in early pregnancy cannot be generalized and is related to the specific situation of the pregnant woman. The normal human body temperature is 36-37℃, and the body temperature of pregnant women is mostly 36.9-37.2℃ at the beginning of pregnancy due to the increase of progesterone level in the body, at which time pregnant women will feel their body temperature rise, which is a kind of early pregnancy reaction and belongs to the normal phenomenon. The onset of slightly elevated body temperature of pregnant women in early pregnancy varies, some pregnant women can appear on the 10th day after intercourse, which can last until the first three months of pregnancy, and some pregnant women may not show symptoms of elevated body temperature, there are specific differences. If you have a temperature greater than 38°C in the first trimester of pregnancy, you should consult the obstetrics and gynecology department promptly. In addition, if you have a low fever in early pregnancy, you can drink more warm water and use alcohol to wipe your forehead and armpits for physical cooling treatment.