You will not get pregnant if you have a regular menstrual cycle, which is usually 30 days, and you have five days left to menstruate. This is because the egg is released 14 days before the period, and in the absence of fertilization, the egg will die naturally within 24 hours. If there are five days left for menstruation, the egg is already dead and you won’t get pregnant even if you have intercourse. It is recommended that if you want to use the safe period as a contraceptive, you must have regular periods to use the safe period as a contraceptive, so that it is relatively safe. If you have irregular periods, or if your menstrual cycle changes during that month due to emotional or environmental influences, it is not safe to use the safe period for contraception, and you may get pregnant.