Okay, here is an article with the title of when is ovulation when menstruation starts on the 5th:

What is ovulation?

The ovulation period refers to the time in each month when a woman’s body temperature rises, her appetite increases, and she is energetic. Generally speaking, women's ovulation period is around the 14th of each month, but the specific date will vary depending on individual differences.

How to predict ovulation?

There are many ways to predict ovulation, the most common of which are using a thermometer and the calendar method. Using a thermometer can measure a woman's basal body temperature to predict possible ovulation. The calendar rule refers to calculating the possible ovulation period based on a woman’s menstrual cycle and date.

Other methods include observing changes in appetite and energy, observing vaginal discharge, etc. These methods have certain scientific basis, but they require personal practice and summary.

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That’s all about what ovulation is and how to predict it. If you have any other questions, please feel free to continue consulting.