The safe period for women is during the luteal phase and follicular phase, which is 7 days before and 8 days after the first day of menstruation. The first 7 days of menstruation is the luteal phase, when the corpus luteum has formed and secretes progesterone, and there will be no mature eggs growing and developing on the ovaries, and no eggs will be discharged, so it is not easy to get pregnant when having intercourse without using contraception, which is why it is called the safe period. The follicular phase is also a woman’s menstrual period, there will be the discharge of menstrual blood, so the chances of pregnancy at this time is lower, but after the menstrual period is clean, if ovulation occurs early, it may lead to unintended pregnancy, that is to say, the safe period is not 100% safe. Because women’s menstrual period is usually around 3-7 days, the ovaries may ovulate early after the menstrual period is cleared, so if you don’t have the need to have children, you should also use contraception during intercourse.