As long as one sperm can enter the fallopian tube, it may then unite with the egg and lead to conception, so the number of entering sperm is not an absolute requirement for pregnancy. After intercourse, male semen will accumulate in the vagina, and after 20 minutes of semen liquefaction, the sperm can travel to the cervical opening, and then it will be able to gain energy at the endocervix, and then the sperm will have obvious ability to move and travel, so the sperm after gaining energy will travel with the uterine cavity to the fallopian tube, and then fertilize with the egg on the fallopian tube. There is no special requirement for the number of sperm entering the vagina, even if there is a small amount of sperm in the male prostate fluid, it may cause an unwanted pregnancy, so as long as there is sperm entering the fallopian tube and fertilizing and uniting with the egg, then conception is possible. It is not the number of sperm that determines conception. Conception depends on the ability of the sperm to travel and whether there are deformities in the sperm, as well as on whether there is egg discharge and the quality of the egg, and whether the fallopian tubes are open. If the environment in the uterine cavity is poor, the fertilized egg will fail to implant. Therefore, pregnancy is a normal physiological process and there is no need to care about the exact number of sperm entering the vagina, nor is there a way to count them.