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Not only is your center of gravity shifting and putting extra strain on your back, but the hormone relaxin is also causing your ligaments and joints to stretch and loosen, which means additional achiness in your back.

Below are some ultrasound images of 4 weeks pregnancy to help you know what you can see on this stage.

Your body is now starting to make the pregnancy hormone hCG.

Now no bigger than a poppy seed though a whole lot sweeter , the ball of cells that will become your baby has completed its weeklong voyage down your fallopian tube and has claimed its berth in your uterus by tunneling into the sticky uterine lining.

Estimates vary, but at least 1 in 2 women get stretch marks, though you're a likely candidate if your mom had them during pregnancy.

This Internet site provides information of a general nature and is designed for educational purposes only.

Eat a balanced diet from all of the food groups.

The embryo now has three distinct layers of cells that will grow into specialized parts of your baby's body.

This helps to form your baby's nervous system and offers some protection from conditions such as spina bifida.