Generally speaking, pregnancy can be detected when the rise in basal body temperature lasts for about 14 days, but there are individual differences and errors. For women with regular menstrual cycles, the rise in progesterone levels during ovulation can cause the basal body temperature to rise by 0.3℃~0.5℃, and the ovulation period can be estimated by monitoring the basal body temperature under the guidance of a doctor. If conception due to progesterone levels will also rise, the basal body temperature will also be maintained in a relatively high state, when the basal body temperature continues to rise for about 14 days can be detected pregnancy. However, the monitoring of basal body temperature will be affected by the ambient temperature, whether the activity and other factors, so there will be individual differences and errors, the accuracy is not very reliable, for the desire to give birth to a woman, under the guidance of the doctor through the ultrasound follicle development to estimate the accuracy of the ovulation period is higher.