Incorrect menstruation is a very common problem, but it may also affect women's reproductive health. Many people believe that menstruation is fixed every month, but in fact the timing and quality of menstruation can be affected by a variety of factors, including genetics, hormonal changes, lifestyle and health conditions.

Measuring basal body temperature is a simple and effective way to help women determine when they are ovulating. Specifically, women should measure their temperature when they wake up every morning and then record the time when the temperature changes. Generally speaking, a woman's body temperature will rise by 0.3-0.5 degrees Celsius during ovulation, and will maintain this trend in the following days.

Observing body temperature changes in the days after menstruation is also a simple and effective method. Women should start taking their temperature within a few days after their period ends and record the timing of temperature changes. Generally speaking, a woman's body temperature will rise by 0.3-0.5 degrees Celsius during ovulation, and will maintain this trend in the following days.

Using ovulation test strips is also a simple and effective way to help women determine when they are ovulating.