How should women calculate their dangerous period?

For female friends, it is very easy to get pregnant if they have unprotected sex during the dangerous period, so we also need to pay attention to the calculation method of the dangerous period. Generally, the dangerous period is from the eleventh to the nineteenth day of menstruation, so we need to pay attention to the time calculation method of these dangerous periods.

1. A woman usually releases only one egg during one menstrual cycle, and the egg's ability to conceive (i.e. survival) is only 24-48 hours after it is released from the ovary (waiting for fertilization in the fallopian tube), and the lifespan of sperm in the female reproductive tract is about 2-3 days. Therefore, if you have sexual intercourse 2-3 days before ovulation and 1-2 days after ovulation, you may become pregnant. This period is called the fertile period, also called the "dangerous period" or the conception period.

2. The egg's ability to conceive is only 24 hours at most after ovulation, while the lifespan of sperm is about 3-4 days. Ovulation can sometimes occur a few days earlier or later, so the dangerous period should be extended by a few days, which is "five or six days before ovulation to two or three days after ovulation." Ovulation usually occurs between two menstrual periods.

3. In addition, there is a universal and simple quick calculation method: "The longest menstrual cycle minus 11, the shortest cycle minus 18", and the dangerous period is in between. For example, if menstruation comes every 28-30 days, 30-11=19, 28-18=10, the dangerous period is from the 11th to the 19th day of menstruation.

4: The safe period is not absolutely safe

The time of female ovulation is affected by factors such as the external environment, climate, her own mood, and health status, which may result in delayed or early ovulation, and extra ovulation may also occur. The failure rate of safe period contraception is about 20%. Generally, people with irregular menstrual cycles are not suitable for using the safe period method for contraception.