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.
It is possible to have cramping and implantation bleeding when you are supposed to have your period. This is why women usually mistake these signs with the signs of menstruation. If these last only for a day or two and the symptoms arenât as severe as a period, most probably you are pregnant.ramping and bleeding. As it has been mentioned before regarding cramps during implantation, not all women experience it. Keep in mind that fertilization usually takes place 6-8 days after intercourse, so this is the time to keep an eye out for the cramps.