Sudden fever in women is not a sign of pregnancy and there is no relationship between fever and pregnancy. Fever is usually caused by cold, flu or various bacterial, viral or microbial infections, or by other internal diseases. This kind of temperature increase is an abnormal increase in body temperature, the temperature is greater than 37.2 ℃, the patient will be accompanied by chills, fear of cold, or nasal congestion, runny nose, body aches and other clinical symptoms, through the examination of blood routine, C-reactive protein, respiratory viruses, etc. can be clearly diagnosed. After pregnancy, women’s body temperature is on the high side, but the normal increase in body temperature is the increase in basal body temperature, women’s body temperature after pregnancy is below 37.2 ℃, but it will be higher than the patient’s temperature before ovulation by 0.3-0.5 ℃ or so, and the increase in body temperature does not occur after pregnancy, but after the patient’s ovulation, and will be maintained during the period of pregnancy.