Yohtex usually refers to levonorgestrel tablets, and if a woman is having intercourse without the need to prepare for pregnancy, she will need to take levonorgestrel tablets outside of her safe period as well. For women with normal menstrual cycles, the safe period refers to the seven days before the onset of menstruation, and eight days after the end of menstruation is the safe period. Except for menstruation and ovulation, the rest of the time is the safe period. However, safe period is only a relative concept. Women who have irregular periods and those who use sex hormone drugs may also ovulate during the safe period, so it is not recommended that these women use safe period contraception. When a woman has intercourse during the safe period, even though she ejaculates outside the body, there is still a possibility of pregnancy. The main reason is that when a man ejaculates, his body will secrete a large amount of prostate fluid, which will contain a small amount of sperm, and if this leads to sperm being left behind in the vagina and entering the fallopian tubes through the uterine cavity, there is still a possibility of a fertilized egg being formed. Therefore, women in the safe period of extracorporeal ejaculation is also need to take contraceptive measures, but the drug for the female organism is more harmful, should be in the doctor’s guidance under the reasonable use.