Menstruation just clean the same room can be pregnant not

Menstruation just clean with the room may be pregnant. For menstrual cycle is more regular, menstrual cycle time is about 28 days of women, after menstruation clean, normal in the so-called safe period after eight days of menstruation is not easy to pregnant period, what is the safe period? The principle of the safe period is based on ovulation time in the middle of the menstrual cycle, so people think that in the first week or after ovulation can prevent successful fertilization. However, for women with irregular menstrual cycles, the so-called safe period is not safe, and the ovulation time of the human body is not fixed, occasionally fluctuates due to environmental factors and psychological factors, so it is not a safe period to just finish menstruation, or there is a possibility of conception.