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.
Since bleeding that occurs in the first half of pregnancy is so common, many wonder what the causes are besides some of the complications already mentioned. Bleeding can occur in early pregnancy due to the following factors: Implantation bleeding can occur anywhere from 6-12 days after possible conception. Every woman will experience implantation bleeding differentlyâsome will lightly spot for a few hours, while others may have some light spotting for a couple of days.