How to calculate the ovulation period?

Ovulation is calculated mainly through menstrual cycles. If a woman's menstrual cycle is regular, then the next menstrual cycle can be calculated directly. In the first 14 days of the next menstrual cycle, it is considered as ovulation day. The first four days and the last five days of ovulation belong to ovulation. However, if a woman's menstrual cycle is irregular, then there is no way to calculate the specific time of the next menstrual cycle. Then for the calculation of ovulation period, you can choose to use B-ultrasound to detect follicular development, or directly select ovulation test paper to monitor, and then determine ovulation period.