When a woman is pregnant these are good news to her but she doesn't have any idea about the yukky side effects. Some of the side effects of the pregnancy are nausea, swollen feet and itchy stretch marks. You also encounter some physical changes, your breast enlarge, you may increase in size and you find yourself adding weight, your tummy will protrude showing the baby bump. When you are pregnant you blood volume increases because it is need for your growing baby. The hormones are on the high level and you will find other parts of your body darkening but its not something to worry about hence the darkening fades away after six months when you deliver. But in some women the skin remains the same. You can use sunscreen.