After the fertilized egg is implanted, the body temperature will generally drop, and the range of temperature drop is generally around 0.5℃, and the range of temperature drop varies among women with different body types, and the temperature drop generally lasts for 1 day, and the body temperature will recover on the second day. The temperature drop is a reference symptom to determine the successful implantation of the fertilized egg. The temperature drop is based on the accurate measurement of the basal body temperature. Basal body temperature is to compare your low temperature with high temperature, as long as the difference between high and low temperature can be more than 0.3℃-0.5℃, it is normal. According to the curve of basal body temperature, several correct judgments can be made. In the low-temperature high-temperature excessive will appear very low temperature, generally lower than 36.5 ℃, this very low temperature is often the day of ovulation. This is because when the follicle ruptures, estrogen will drop intensely, and the drop in estrogen will also affect the body temperature. Going into the high temperature, the corpus luteum has a lifespan of 14 days, so it will always last about 12 days. When it is noticed that on the 8th-10th day after ovulation, there is a sudden drop in temperature one day, and on the next day the temperature has risen significantly, this sudden low temperature is an implantation hypothermia. The method of measuring basal body temperature is very simple. After waking up in the morning without any movement of the body, measure the temperature of the mouth with a thermometer, write it down on a pre-prepared basal body temperature chart, and after insisting on it for 1 month, connect the number of temperatures of the 1-month period with a line to form a curve for observation.