The correct way to measure ovulation is the basal body temperature measurement method. Women should measure their resting body temperature early in the morning every day during their menstrual cycle, record the value and connect it to the curve, and the next day after ovulation, the body temperature may rise and last for about 14 days, which can be relied upon to determine the day of ovulation. It is recommended to place the thermometer within reach every night before going to bed. In the early morning before waking up and doing activities, without getting up, talking or eating, immediately place the thermometer in the mouth and measure for at least 5 minutes, then take it out and record the temperature, and mark the daily temperature measurement on the temperature scale, which is usually recommended to be measured for more than three menstrual cycles. Normal women usually have a low basal body temperature during ovulation, and after ovulation the temperature can rise 0.3-0.5 degrees Celsius, lasting until 1-2 days before menstruation, which is important for determining whether ovulation occurs and observing the luteal function. It should also be noted that if there is a cold, fever, insomnia, application of progesterone, etc., it should be excluded in the determination of basal body temperature.