Is the fourth day after the end of menstruation the safe period?

Patient's question:

No

Doctor's answer:

The date of ovulation for women is generally about 14 days before the next menstrual period. Starting from the first day of the next menstrual period, count backwards 14 days or subtract 14 days to determine the ovulation day. The ovulation day, along with the 5 days before it and the 4 days after it, together constitute the ovulation period. Excluding the menstrual period and the ovulation period, the remaining time is considered the safe period.