A few days before menstruation is a relatively safe period, such as regular menstruation generally will not get pregnant, but is not absolutely safe, irregular menstruation may be accidentally pregnant.
For women with regular menstrual cycles of about 28 to 30 days, a few days before menstruation is a relatively safe period, generally do not need contraception when having sex, the chances of pregnancy are very small.
However, the safe period is not absolutely safe and reliable, such as irregular menstrual cycle, ovulation time is not fixed, the safe period of time is not stable, a few days before menstruation may also occur accidental ovulation, as long as there is no contraceptive measures may be accidentally pregnant.
Furthermore, there are many factors that affect ovulation, such as taking medication, environmental changes, fatigue, stress and other factors may affect the time of ovulation, so a few days before menstruation is not an absolute safe period.
The female safe period can not be used as a regular contraceptive method, if there is no plan to conceive, it is recommended to take good contraceptive measures when having sex, such as men wearing condoms, women wearing a ring, taking birth control pills and so on.