The basal body temperature of women before ovulation is relatively low, generally between 36.3℃-36.6℃, with some individual differences. By the day of ovulation, the basal body temperature may also drop by about 0.2℃. Once ovulation occurs in the ovary and the corpus luteum is formed, the corpus luteum cells can influence the temperature regulation center, causing the basal body temperature to rise by about 0.3℃-0.5℃, which usually lasts for 14-15 days. If there is no conception, the basal body temperature drops and then menstruation comes. If the rise in basal body temperature after ovulation lasts for more than 20 days without a drop, the possibility of pregnancy is considered relatively high. You can determine if you are pregnant by a blood HCG test more than 8-10 days from the time of intercourse. If it is pregnancy, it can show a positive indicator.