Many factors can affect a woman's menstrual cycle and ovulation, including age, health, medication use and lifestyle. Although ovulation strips are one of the common ways to monitor ovulation, they are not completely reliable. Sometimes, a woman may release an egg outside of her ovulation period, or the egg may not be fertilized after it is released. Therefore, even under normal circumstances, ovulation papers cannot completely accurately predict a woman's ovulation period.

1. Measure basal body temperature: Women should measure their body temperature when they wake up every morning and record changes in body temperature. Generally speaking, a woman's body temperature will rise by 0.5 to 1 degree Celsius during ovulation.

2. Observe cervical mucus: During the ovulation period, a woman’s cervical mucus will become clear and transparent, and the amount will also increase. This mucus helps sperm penetrate cell membranes, so it is very useful to look at cervical mucus to determine when you are ovulating.

3. Conduct B-ultrasound monitoring: Through B-ultrasound monitoring, women can accurately determine their ovulation period. B-ultrasound can predict a woman's ovulation period by detecting the health of the uterus and ovaries.