A woman with male sperm in her vaginal opening has the possibility of pregnancy because sperm is motile, and if it meets a follicle it will form a fertilized egg, leading to pregnancy. Female vaginal opening with male sperm, because the sperm itself has power, the vagina moist environment is conducive to a part of the sperm quickly enter the vagina to reach the cervix, if the woman is in the ovulation period, the sperm and the egg will meet, combined into a fertilized egg, resulting in pregnancy. If a woman is in the ovulation period, the possibility of pregnancy is higher, if in the safe period, there is also a chance of pregnancy, need to remain vigilant. It is recommended that women go to the hospital after half a month of sexual intercourse for an early pregnancy test, or HCG test, to clarify whether they are pregnant or not, and then treat the symptoms.