Saliva and saliva entering the vagina will not cause pregnancy. Pregnancy is a complex process that requires a man and a woman to have intercourse, for the man to ejaculate sperm into the woman’s vagina, for the sperm and the egg to unite in the fallopian tube to form a fertilized egg, and for the egg to successfully migrate into the uterus to be laid, and for the woman to successfully conceive, and any problem in any of these steps may cause the pregnancy to fail. Moreover, saliva cannot replace sperm and sperm is not usually present in saliva, so it is said that saliva entering the vagina will not lead to pregnancy.