How many days is the pregnancy risk period?

The dangerous period of pregnancy is named relative to the safe period. The safe period is often eight days after the end of menstruation and seven days before the next menstruation. In addition to the safe period, it is the dangerous period. Therefore, strict contraception is needed during this period. The probability of pregnancy during the dangerous period is relatively large. However, there is also an ovulation period in the dangerous period, that is to say. The 14th day before the next menstruation is ovulation, ovulation, often ovulation time, during this period if the probability of sexual life pregnancy is the largest, then in the dangerous period inside the closer to ovulation, the easier it is to get pregnant, so this is the need for strict contraception, generally speaking, after the safe period and dangerous period to contraception, this effect is not accurate, because in the safe period or possible pregnancy, but the probability is relatively small.