When a woman is pregnant, the cervical canal is sealed by a cervical mucus plug that protects the baby during pregnancy and prevents the entrance of anything that could damage the baby. Keeping this in mind, sperm are unable to enter the uterus, so their journey ends in the vagina. Most of them will just leak out after ejaculation, while a small percentage might remain there and die within a few days.
Read the full article on: How sperm meets egg: a journey from production to fertilization ( 38).
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.