The body temperature during ovulation is around 36.2°C. The body temperature during ovulation is the lowest and will rise by 0.3-0.5°C after ovulation. After sex occurs during ovulation, the egg and sperm are able to unite and develop into a fertilized egg, which will last up to 18 days or more, and an early pregnancy is highly suspected. If the elevated temperature continues to fall for about 14 days, the onset of menstruation will occur. Therefore, the change in body temperature during and after ovulation can be used to initially determine whether a woman is experiencing pregnancy, but this method may sometimes be inaccurate. It is better to combine a comprehensive judgment with blood tests for human chorionic gonadotropin and gynecological ultrasound for more accurate results. In a few cases, a woman may have an elevated body temperature after ovulation, but it may be related to a woman suffering from a cold or tuberculosis, and has nothing to do with pregnancy.