Sperm just entered the female vagina, there is no feeling, so at this time is unable to feel whether there is pregnancy. Sperm has the characteristic of moving forward, can penetrate the cervical mucus into the uterine cavity, and then like a tadpole, swim to the fallopian tube, when it can successfully combine with the egg into a fertilized egg and enter the uterus to bed, then it will be considered a successful pregnancy. And this process is unknowingly occurring, the body does not feel, only when the fertilized egg and the endometrial nodules produce a large amount of HCG, the woman will appear corresponding early pregnancy reaction, such as mild abdominal pain, breast tenderness, small amount of vaginal bleeding and so on.