Fertilization: Sperm Penetrates Egg. It takes about 24 hours for a sperm cell to fertilize an egg. When the sperm penetrates the egg, the surface of the egg changes so that no other sperm can enter. At the moment of fertilization, the baby's genetic makeup is complete, including whether it's a boy or girl.
Implantation bleeding is an early sign of pregnancy and only experienced by 1/3 of women. Discover when and what to look for as a sign of implantation. Implantation bleeding is an early sign of pregnancy and only experienced by 1/3 of women.
Keyword Tags: pregnancy symptoms pregnancy implantation bleeding implantation spotting implantation implantation cramping implantation symptoms. Implantation bleeding and spotting is among the very first of the typical pregnancy symptoms and pregnancy signs. Implantation bleeding or spotting is thought to happen when the fertilized egg attached to the lining of the uterus. Some women experience implantation bleeding while others never do. Having implantation bleeding can also be confused with having menstrual bleeding or your period.