Dating pregnancy long cycle
The fertilized egg, known as a zygote, then moves toward the uterus, a journey that can take up to a week to complete.
Cell division begins approximately 24 to 36 hours after the female and male cells unite.
Cell division continues at a rapid rate and the cells then develop into what is known as a blastocyst.
The blastocyst arrives at the uterus and attaches to the uterine wall, a process known as implantation.
By the end of the embryonic stage, the beginnings of features such as fingers, eyes, mouth, and ears become visible.
The fusion of female and male gametes usually occurs following the act of sexual intercourse.