Is the ovulation date calculated from the day after menstruation is clean?

Patient's question:

Patient Age: 28
Detailed Medical Condition and Purpose of Consultation: Is the ovulation date calculated from the day after menstruation?

Doctor's answer:

For women with a regular menstrual cycle, you calculate when your next period will come. Subtract 14 days from the first day of your next period. This day is your ovulation day. If this woman's menstrual cycle is 28 days, her ovulation day should be around the 14th day of her cycle. If this woman's menstrual cycle is 40 days, her ovulation day should be around the 26th day of her cycle (approximately 14 days before her next period).