Ovulation refers to a period of time in a woman's menstrual cycle, usually 14 days from the first day of her next menstrual period. During this time, a woman’s eggs will mature and be released, which is an important period for women’s fertility. However, the method of calculating ovulation may differ for different people.

Another method is to use a calendar to determine ovulation. This method requires women to understand their menstrual cycle and calculate their ovulation period. Generally speaking, women will release eggs on the 14th day of the menstrual cycle, and the days before and after this day are dangerous times.

In addition to these methods, there are some other ways to determine ovulation. For example, women can determine when they are ovulating by observing their symptoms, such as breast swelling, headaches, and nausea.

Determining ovulation is not a simple matter. Women need to understand their menstrual cycle and use some scientific methods to determine it. If a woman is unsure when she will release an egg, she may consider talking to her doctor or professional health care advisor.