Do you feel different? You'll find yourself analyzing every twinge in your body as you look for signs that you're pregnant.

As the fertilized egg becomes completely embedded in your uterus, it may cause some light bleeding.

Complex changes are taking place inside your uterus to create a safe and nourishing environment for your unborn baby.

Are you feeling irritable and tired, and are your breasts tender? Well, you might just be pregnant!

You may still be confused about whether or not you're pregnant, or you may want to find out more about early pregnancy signs, symptoms and your baby's size (no bigger than a poppy seed!)

At 4 weeks and 2 days, it's the third week since conception and the cells that will become the embryo move to form the basis of the central nervous system.

Happy? Excited? But a little nervous? There is no greater life-changing event than finding out you're going to be parents.

You're probably eager to know when your baby will be born. The chart below will tell you the expected date of delivery.

Although there's lots of information to take in, try to enjoy this time and remember pregnancy is a natural process.

The placenta-the structure that will become your unborn baby's lifeline-is forming.

At this important stage of development, the building blocks of your baby's spine are being laid down.

At 5 weeks and 1 day pregnant, the embryo now has 14 somites-the building blocks of your baby's muscular system. Click here to find the first nine pairs.

There won't be any visible signs of pregnancy on the outside for some time, but there are many changes taking place inside.

Morning sickness is one of the most common and least welcome symptoms of pregnancy.

5 weeks and 4 days is a crucial time for your developing baby. Click here to find out more about how your the newly developing rate of your baby.

At 5 weeks and 5 days of pregnancy, you've now only got 240 days until the big day. Click here to find out more about what to expect during this time.

You may notice a marked increase in your breast size, even at this early stage of pregnancy.

By the end of this sixth week, one of your baby's major organs-the heart-is rapidly developing and circulating blood.