For some couples, arriving at the miracle of birth is more
complex than sperm + egg = embryo = pregnant. The human body is
incredibly complex, and few processes are as complicated as
human reproduction. For example, consider the first five days in
the reproduction process: Day 0 – Egg meets sperm in the
fallopian tube. Sperm penetrates egg. Day 1 – Fertilization
occurs and a zygote forms, which includes DNA from both the male
and female. Day 2 – The zygote has evolved into an embryo. Cell
count is now four. Days 3 to 5 – Even more growing as the cells
split. There are now eight cells. The embryo leaves the
fallopian tube and enters the uterus. Day 5– Embryo hatches,
blastocyst embryo erupts and implants into the uterine wall, and
a woman is deemed pregnant.