Predicting ovulation is an ancient method that helps women determine the best time to get pregnant if they want to have a baby. Although there are many ways to predict ovulation, generally speaking, they all have a certain degree of accuracy.

Thermometry refers to measuring a woman's basal body temperature, which can change many times a day. Generally speaking, when a woman's body temperature rises, she is likely to ovulate. The accuracy of this method is relatively low because it requires regular body temperature measurements and is affected by many factors, such as air temperature and activity level.

The calendar method refers to inferring the possible ovulation period based on a woman's menstrual cycle and date. This method requires women to understand their menstrual cycles and be able to accurately predict when their next period will be. If a woman's menstrual cycle is 28 days, then their next menstrual period will be around 14 days. In this case, the woman may ovulate some time after 14 days.

Although there are many ways to predict ovulation, generally speaking, they all have a certain degree of accuracy. Women can choose to use one or more of these methods to predict ovulation, depending on their personal circumstances.