How to calculate ovulation period when menstruation is irregular?

Patient's question:

Detailed medical history and purpose of consultation: Pregnant three years ago;
Duration and persistence of current illness: Over a year

Doctor's answer:

Hello: You can use the body temperature measurement method to track ovulation.
Basal body temperature measurement method: Measure your temperature upon waking after a long period of sleep (usually in the morning), before engaging in any activity or speaking, as this is your basal body temperature. Under normal circumstances, the basal body temperature of women of reproductive age is lower in the first half of the menstrual cycle and even lower during ovulation. After ovulation, it can suddenly or gradually rise by 0.3—0.6℃ within 24 hours to a few days.
Therefore, it is best to start measuring your basal body temperature on the first day of your menstrual period, measure it daily, and record the results on graph paper for observation and analysis.

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