In order to know the safe period, you must first pass the level of ovulation, your ovulation period is calculated accurately? If you have a regular menstrual cycle, you can calculate the time of your next menstrual cycle, and ovulation can be simply calculated to about 14 days before your next period. If the menstrual cycle is 28 days, ovulation occurs around the 14th day of the menstrual cycle. If the period is 7 days clean, the 7 days after the period is the ovulation period. If your menstrual cycle is 30 days, you will ovulate around the 16th day of your menstrual cycle. If your period clears on 5 days, you will ovulate on the 11th day after your period. If your menstrual cycle is irregular, ovulation may not be easy to predict, but you can monitor ovulation through ovulation test strips, basal body temperature monitoring, ultrasound, etc. Of course, if your menstrual cycle is regular, you may also experience unexpected ovulation due to emotional and external factors. If you want to get pregnant, you must choose to have intercourse during the ovulation period to have a better chance of getting pregnant. Usually, if your menstrual cycle is normal, you can project the time of your next menstrual period, and about 14 days before your next period is the ovulation period, but due to mental factors or interference from external factors, there may be unexpected ovulation, also However, due to mental or external factors, there can be unexpected ovulation, that is, ovulation outside of the ovulation period, that is, ovulation during the safe period, so it is possible to get pregnant without having intercourse during the ovulation period, but the chances are lower. So safe period contraception is not reliable, in case you do not want to get pregnant, you should still do a good job of contraception in advance, such as oral contraceptive drugs, use condoms, but emergency contraceptive pills may affect menstruation, and the effect of contraception is not very accurate, and is not advocated, so do not wait until after pregnancy, and then consider abortion and other remedial measures, the damage to the human body is relatively large.