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Your Pregnancy Week-by-Week: Week 4

You:

You're probably expecting your period this week, and if it doesn't occur it might be one of the first signs that you're pregnant. You may also notice light spotting as the embryo implants itself in your uterus. You might not feel any different yet, but the amniotic cavity, which will be filled with fluid, and the placenta, which will bring oxygen and nutrients to nourish your baby, are forming in your uterus.

Your Baby:

Your baby is still very small, only about 0.014 inches to 0.04 inches in length. The embryo, probably in about its second week of development, has multiplied to about 150 cells. Your baby is being nourished by secretions from the uterine lining. Layers of cells already are specialized according to functions. The outer layer will become the nervous system, skin and hair; the inner layer will be the breathing and digestive organs; and the middle layer will become the skeleton, bones, cartilage, muscles, circulatory system, kidneys and sex organs.

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