Non-safe sex does not necessarily lead to pregnancy, but all other things being equal, the probability of conception is significantly higher. The reason for this is that during the non-safe period, around the time of ovulation, the egg in the woman’s ovary will mature and be discharged, and if there is a healthy sperm that meets the egg and forms a fertilized egg at this time, then you will get pregnant. However, it is not easy for the sperm to unite with the woman’s egg, and it has to go through a lot of trials and tribulations. For example, the sperm that enters the vagina needs to pass through the vaginal secretions and the cervical opening, and after entering the uterine cavity, it has to move on into the fallopian tube before it can combine with the egg. So in itself the occurrence of pregnancy is a matter of probability, even when the body is completely normal without any problems, after sex is not necessarily 100% conceived.