a million sperm and one egg--- it's amazing we get pregnant at all
Again, this above answer describes fertilization, not implantation. Once the egg is fertilized by the sperm (also called fusion of the gametes), its cells begin to divide. It is now a zygote.
Only about 1/3 of zygotes survive the journey through the fallopian tube to implant in the uterine wall (about a 10 day process). If it does, it is now an embryo.
the zygote journey to implantation site is approx. 90 day
Implantation
Implantation.
It is sexy?
zygote divides by mitosis as it travels along the oviduct to the uterus where implantation takes place. The zygote developes into embryo and placenta
implantation
UTERUS
Wherever the zygote lands and burrows in.
The nutrients used by the zygote between fertilization and implantation come from the newly formed placenta. The placenta is what provides nourishment to the developing fetus.
zygote
Implantation is the medical term meaning attachment of the zygote to the uterine wall. If the zygote does not attach, a period occurs.
Because of one factor ie,high vascularity and endometrial thickness