Implanatation:

• Zygote divide by mitosis and process is called cleavage.
• As a result, 2, 4, 8, 16 daughter cells are formed called Blastomers.
• Embryo with 8-16 blastomers is called Morula.
•  And the large mass of cells that get embedded in the uterus is called Blastocyst.Blastomers in blastocyst are arranged into an outer layer called, Trophoblast and an inner cell layer called, Inner cell mass. Trophoblast helps to get embedded in uterus with its endometrium and Inner cell mass gives rise to embryo.
• Blastocyst get embedded in the endometrium of uterus and this process is called Implantation. It leads to pregnancy.

Fertilization events and hormonal control during each phase: