The term “great aunt” generally refers to a woman’s menstrual period. The safe period is related to one’s longest cycle, shortest cycle, and the start time of the period. A week or so after the end of menstruation is usually the safe period, and the period from the day of the complete end of menstruation to three days before the next ovulation is the pre-ovulation safe period.
The safe period is for women with regular menstrual cycles, and the safe period after menstruation generally refers to the period from the end of menstruation to three days before the next ovulation. Generally speaking, if the menstrual cycle is 28 days, the date of ovulation is generally about 14 days before the next menstrual period, and sperms enter the reproductive tract and can survive for 1 to 3 days.
So before three days before ovulation belongs to the safe period, but the safe period is not absolutely safe, there is still a chance of pregnancy.
For women who do not have the need to have children, contraception through the safe period is risky, and you need to take relevant measures during sex to avoid damage to the body caused by unwanted pregnancy.