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Week 4
Now that the embryo has attached to the wall of your uterus, the real work begins. Cells are dividing that will create all of your baby's organs. A fluid-filled cushion called the amniotic sac is forming. Attached to it will be the yolk sac, which will feed baby in these early weeks. He or she is smaller than a grain of rice. -
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Week 1
This is week one of your pregnancy, but you're not officially pregnant yet. Your uterus is thickening so it can house and feed your fertilized egg once it implants. -
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Week 2
you're at the most fertile time of the month — you're ovulating! If a sperm makes its way to a waiting egg in your fallopian tube, you're going to conceive. -
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Week 3
you're pregnant! Sperm and egg have officially merged into one single cell, called a zygote. As the zygote speeds down the fallopian tubes toward the uterus, it will keep dividing. Two cells will become four, four will become eight, and so on. These cells will eventually create every organ in your baby's body. -
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Week 5
At this stage, he or she looks like a tiny collection of tubes. Another is developing into baby's heart. As your baby keeps growing, you might feel the first twinges of pregnancy symptoms, such as sore breasts, morning sickness, and the constant urge to urinate. -
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Week 6
your baby's tiny heart has started to beat. That heart sits inside a body that's now almost 1/2-inch long from the top of the head to the rump Human features are starting to emerge, including two eyes that come complete with lids. The lungs and digestive system are also starting to branch out, forming the organs that will help your baby breathe and eat in just a few months. -
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Week 7
your baby's body is already forming every organ it will need — including the heart, kidneys, liver, lungs, and intestines. Your baby is attached to you by an umbilical cord. Through this connection, you'll provide food, and filter away your baby's wastes until you deliver.