This is about a week to ten days after fertilization.The sperm and the egg cell, which has been released from one of the female's two ovaries, unite in one of the two fallopian tubes.A woman who is (or has been only) pregnant for the first time is referred to as a primigravida, Therefore, during a second pregnancy a woman would be described as gravida 2, para 1 and upon live delivery as gravida 2, para 2.In-progress pregnancies, abortions, miscarriages and/ or stillbirths account for parity values being less than the gravida number.The terms preterm and postterm have largely replaced earlier terms of premature and postmature.Preterm and postterm are defined above, whereas premature and postmature have historical meaning and relate more to the infant's size and state of development rather than to the stage of pregnancy.
By the end of the embryonic stage, the beginnings of features such as fingers, eyes, mouth, and ears become visible.
Through an interplay of hormones that includes follicle stimulating hormone that stimulates folliculogenesis and oogenesis creates a mature egg cell, the female gamete.
Fertilization is the event where the egg cell fuses with the male gamete, spermatozoon.
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.