A woman’s body temperature usually remains stable after pregnancy, and if there is a change in temperature, it will remain in the range of 36.9°C-37.2°C. If the body temperature varies from high to low, it may indicate a luteal deficiency, which may lead to miscarriage or infertility. Therefore, when there is a large change in body temperature, it should be taken seriously, and for pregnant women who have experienced miscarriage, they should go to the hospital for examination and take appropriate measures in time. Normally, the basal body temperature of human body is between 36℃-37.2℃. After the egg is discharged, the follicle forms the corpus luteum to secrete progesterone, and under the influence of the progesterone secreted by the ovary, the basal body temperature will rise by 0.2℃-0.5℃ and last for 14 days. If the egg meets the sperm and unites to form a fertilized egg, the corpus luteum continues to secrete progesterone and the basal body temperature will continue to rise and last for a long period of time. Therefore, by measuring the basal body temperature, you can determine if there is ovulation. If the basal body temperature is biphasic and continues to rise for more than 21 days, you can determine if there is pregnancy. If a pregnant woman has an abnormally high body temperature with discomfort in the early stage of pregnancy, it should be suspected to be fever, and it is recommended to go to the hospital for examination and timely treatment.