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Pregnancy Week 3
How big is your baby?
At the beginning of this week conception will be taking place and by the end of this week your 'baby' will be made up of only a cluster of cells.
Once conception has taken place it takes around 5 days for the embryo to enter
your uterus.
By the end of the week your embryo is only 0.006 inches (0.150mm) long. This is
about as big as this full stop .
Your baby's development
Although your baby is still so small, there is a great deal which is happening. Your baby's sex has already been determined, as this takes place at fertilization. This developing ball of cells is called a Zygote and it will pass through the uterine tube on it's way to the uterus.
As this is taking place the cells are dividing and growing
continueously to form a blastomere, and they in turn will divide to form a solid ball of cells which is called the morula. This in turn will form a blastocyst, which will enter your uterus. It will lie free in the uterus until it attaches itself to the uterus wall.
This is known as implantation, and it is not uncommon the experince some light
spotting and bleeding as the blastocyst implants itself into the uterine lining.
Once implantation occurs development will start to take place at a very fast
pace. In fact the amniotic sac, amniotic cavity, placenta and the yolk sac are already forming.
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