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Week 1-2
Week 3-4
Week 5
Week 6
Week 7
Week 8-9
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Week 20-22
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Week 33
Week 34-35
Week 36-38
Week 39-40

See related -
Pregnancy Weight Gain
Pregnancy Information

Pregnancy a Week by Week Guide

• Pregnancy week by week at week five. The circulatory system will develop and it is the first organ to function. The developing embryo has three layers. The ectoderm layer which is the top layer is where the neural tube will form which will further develop into the nervous system. That is where the brain, spinal cord, skin and hair form. The second layer called the mesoderm, the heart and circulatory system, bones, muscles, kidneys and reproductive organs will develop. In the inner layer named the endoderm a simple tube will develop into the intestines, liver, pancreas and bladder. You will feel hormonal changes that come with your pregnancy as sore breasts or swollen and tender as the milk glands multiply. You feel hungry often or morning sickness kicks in. Since your uterus presses on your bladder you will go to the bathroom more often.