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.
You can take the pregnancy test about 3-4 days after signs of implantation or about a week afterward, after you've missed your period. Implantation bleeding usually lasts about one or two days, and in rare cases it can last a month or two. If you are experiencing extreme pain during bleeding or the color of the blood has turned a deep red, then you need to consult a health care specialist, your mid-wife or family doctor.