Menstruation comes once every two months, how to calculate ovulation?

First, we need to understand what a menstrual cycle is. The menstrual cycle refers to the time when a woman gets her period every month, and usually includes two cycles, the cycle when the egg is released and the cycle when the sperm enters the woman. Typically, a woman's menstrual cycle lasts 28 days, but some may have it longer or shorter.

For women who have irregular periods, their menstrual cycles may look different. In this case, they may need to use other methods to determine ovulation. Some methods include:

1. Watch your sexual desire: Some women may experience an increase in sexual desire during ovulation. This may be caused by increased levels of female hormones due to the release of eggs.

2. Measure body temperature: Women can determine their ovulation period by measuring their body temperature. Generally speaking, a woman's body temperature will rise by 0.5 to 1 degree Celsius during ovulation.

3. Use David test strips: David test strips are a commonly used method of testing pregnancy.