Patient's question:
Detailed medical condition and consultation purpose: Doctor, I would like to ask that my last menstrual period was on the 14th of this month, and it lasts about four days each time. Last night (the 20th), I had sex with my husband without taking any precautions. Is there a possibility of pregnancy? Should I take emergency contraception? What are the generally considered safest days in terms of a conservative safe period?Doctor's answer:
Hello:You are in the safe period, and pregnancy is generally unlikely. If you have intercourse within 72 hours, you can take emergency contraception.
The method of calculating ovulation based on the menstrual cycle is also known as the calendar method. Both menstruation and ovulation are influenced by the endocrine hormones of the pituitary gland and ovaries, exhibiting cyclical changes. The lengths of both cycles are consistent, occurring once each 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, usually around 14 days. Based on this relationship between ovulation and menstruation, it is possible to calculate the ovulation period based on 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 days before the ovulation day (up to 5 days) and the days after (up to 4 days) 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 2, her next menstrual period will occur on December 30 (December 2 plus 28 days). Subtracting 14 days from December 30 gives December 16 as the ovulation day. The days before the ovulation day (up to 5 days) and the days after (up to 4 days), or December 11–20, represent the ovulation period. Except for the menstrual period and ovulation period, all other times are considered the safe period.