Patient's question:
Currently, in general: My menstrual cycle is on October 12th, November 15th, and December 15th. What is the most fertile date next month, and what is the dangerous period for ovulation?Doctor's answer:
The method of calculating ovulation based on the menstrual cycle is also known as the calendar method. Both menstruation and ovulation are influenced by endocrine hormones from the pituitary gland and ovaries, exhibiting cyclical changes. The lengths of both cycles are consistent, occurring once per month, with ovulation occurring between two menstrual periods. A woman's menstrual cycle can vary in length, but the interval between the day of ovulation and the start of the next menstrual period is relatively fixed, generally around 14 days. Based on this relationship between ovulation and menstruation, it is possible to calculate the ovulation period according to the menstrual cycle. The calculation method starts from the first day of the next menstrual period, subtracting 14 days (or counting backward 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. This is the theoretical basis for the safe period method of contraception. For example, if a woman has a 28-day menstrual cycle and her first day of the current menstrual period is December 1, her next menstrual period will occur on December 29 (December 1 plus 28 days). Subtracting 14 days from December 29 gives December 15 as the ovulation day. The ovulation period, which includes the ovulation day and the 5 days before and 4 days after, is from December 10 to 19. Except for the menstrual period and ovulation period, all other times are considered the safe period.