Patient's question:
My menstrual cycle is 40-50 days. Please let me know if the ovulation period is calculated from the first day of menstruation to around the 14th day, or from about 14 days before the next menstrual period. Could you please help me determine my specific ovulation date? Thank you.Doctor's answer:
Women are most fertile around the 14th day before their next menstrual period, which is the ovulation day. The 5 days before and 4 days after ovulation constitute the fertile window, also known as the "dangerous period." The exact calculation depends on your menstrual cycle. The probability of pregnancy is higher during the fertile window. If you do not have a plan to get pregnant, it is recommended to take contraceptive measures before sexual activity to avoid an unintended pregnancy. The calculation formula is as follows:First day of the fertile window: Cycle days minus 18
Last day of the fertile window: Cycle days minus 11