If you don’t take contraceptive measures, it’s not safe, if you usually have a short menstrual cycle, the day after the menstrual cycle may occur ovulation, not take contraceptive measures, may lead to unwanted pregnancy, safety, in order to reduce the harm of unwanted pregnancy on women, in the menstrual cycle any day of the same sex, have to take effective contraceptive measures, in order to avoid unwanted pregnancy. In fact, there is no absolute safe period, even if it is safe to have sex, there may also be accidental ovulation, usually pay attention to the vulva hygiene, before and after sex to wash the vulva, can reduce the chances of suffering from gynecological inflammation, it is recommended to take effective contraception, do not exist in a fluke mentality.