​How many days before a woman’s menstrual period is the safe period?

Recently I heard my colleagues discussing the issue of safe period, because one of my colleagues had sex during the safe period, but it led to an unexpected pregnancy. This made everyone question the calculation of the safe period. So let's take a look at how many days before a woman's menstrual period is the safe period?

The safe period is a method of calculating contraception. Compared with other contraceptive methods such as birth control pills, calculating the safe period has fewer side effects and is therefore chosen by most people. The safe period contraceptive method requires precise calculation of time to reduce the chance of contraceptive failure.

3 days before and 4 days after menstruation. Generally, for women who have always had regular menstrual cycles, ovulation may occur on the 14th day before the next menstrual period. After the egg is released, it can survive for about 2 to 5 days, and the sperm can survive for 1 to 3 days after entering the female reproductive tract. Therefore, it is easy to get pregnant by having sexual intercourse 5-7 days before ovulation and 4-6 days after ovulation. Other dates are relatively safe. The safe period is divided into the safe period before ovulation and the safe period after ovulation. The period from the end of menstruation to the day before ovulation is the safe period before ovulation. From the first day after the end of ovulation to the day before the next menstrual cramps is the safe period after ovulation.

In addition to the calendar method that uses days to calculate, there are also methods for calculating the safe period such as the basal body temperature method and secretion observation method. It is worth noting that the safe period is not absolutely safe. Sometimes women ovulate earlier or later, and the judgment of the safe period becomes invalid at this time. Determining the safe period can only reduce the chance of pregnancy.

After reading the above, I believe everyone will find that the safe period mentioned here does not mean absolute safety for women, because many other external factors can easily cause changes in people's menstrual periods and hormone secretion in the body, which may very likely lead to unexpected pregnancy.