The method of taking temperature to measure ovulation: 1, every day will be fixed in the morning when you just wake up to measure, you need to lie still after waking up, put the thermometer in the hand can easily get to the place, but pay attention not to move around. Put the thermometer under the tongue, because the tongue will not be disturbed by the temperature of the external environment, the measurement is more accurate, the measurement time of about 5 minutes can be. 2, the female body temperature before ovulation will generally be low, after ovulation body temperature will rise, generally in about 0.5 ℃, so the temperature curve shows a two-way temperature, by observing the temperature changes, you can know the ovulation day. 3, ovulation day generally occurs on the 14th day before menstruation, so you should notice the change of body temperature on the 18th day before menstruation. However, abnormal conditions such as cold and fever can easily affect the change of body temperature, so you need to mark it well.