How to calculate ovulation period when menstruation is delayed by 10 days

Patient's question:

My menstrual cycle has always been quite regular, with a period of 30 days. However, this month, it arrived only after 10 days. Could you please tell me how to calculate this month's ovulation period? And when will my period come next month? It arrived on the 22nd of this month.

Doctor's answer:

Monitoring can be done through the following methods:
1. Basal body temperature measurement. That is: the temperature measured after the body has been asleep for a relatively long time (usually in the morning) and before any activity or speech has occurred is the basal body temperature. Under normal circumstances, the basal body temperature of women of childbearing age is lower in the first half of the menstrual cycle, even lower during ovulation, and can suddenly or gradually rise by 0.3—0.6℃ within 24 hours to a few days after ovulation.
2. You can buy ovulation test strips at a pharmacy to test and calculate the ovulation period.
3. You can go to a hospital for an ultrasound to monitor ovulation.

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