the moment of ovulation
At about day 14 of the menstrual cycle, a mature egg bursts from a follicle in the ovary and travels into the fallopian tube

the journey of the sperm
At the point of ejaculation, sperm stream through the cervix and into the uterus to begin their journey to the egg

sperm travel through the fallopian tube
The fallopian tubes have a frond-filled lining that helps to fan the sperm toward the egg

From conception to implantation
The fertilized cell that results from the fusion of the egg and sperm is called a zygote, which divides into two identical cells and continues to divide as it begins its journey down the fallopian tube until it forms a bundle of cells known as a morula. By the time it reaches the uterus, it forms a bundle of around 100 cells, called a blastocyst. About a week after fertilization, the blastocyst embeds itself in the lining of the uterus, the endometrium. At this point the pregnancy is established; the blastocyst develops into an embryo and the placenta develops.
The hormone human chorionic gonadotrophin (hCG) is released; this stimulates the production of progesterone, which maintains the lining of the uterus.

The journey to the uterus
It takes approximately seven
days from the moment the egg is fertilized in the tube to
the implantation of the blastocyst in the lining of the uterus

fertilization of the egg
The surviving sperm swarm all over the egg, releasing enzymes to break down the egg’s outer layer.One sperm penetrates the egg

the division of cells
At about four days after conception, the fertilized egg has divided repeatedly to form a bundle of cells called a morula