Your body is undergoing dramatic changes when you are three weeks pregnant, with hormone levels rising and amniotic fluid increasing to protect the baby.
Your Body at Three Weeks Pregnant
When you are pregnant at three weeks, your body continues to transform itself in order to properly grow and protect the embryo that will eventually be your baby. Now that you have reached the third week, your body will begin to produce hCG, the pregnancy hormones that are responsible for positive pregnancy test results. At this point, you will most likely be able to take an accurate home pregnancy test.
Although you may have some morning sickness or some lower back pain, your symptoms at three weeks pregnant are probably still relatively mild. Your breasts will continue to become fuller and you may discover that your bras are fitting a bit snugger.
Your Baby at Three Weeks
Although your baby is still basically a ball of cells (sometimes called a blastocyst), these cells are now dividing rapidly. The two-layer ball of cells from week two has become a tiny ball of hundreds of cells. Your body will begin producing and collecting amniotic fluid to cushion the baby as he or she grows larger. Your baby is still getting nutrients and oxygen through a primitive circulatory system that will eventually develop into the placenta and umbilical cord toward the end of your fourth week.
What to Consider When You're Three Weeks Pregnant
You may experience some mild blood spotting at three weeks, but there is no need to panic. One of the first symptoms at three weeks pregnant is light spotting that is probably caused by your fertilized egg burrowing its way into the lining of your uterus, which is full of nutrients. While some women do have this spotting, not all of them do. If you have concerns, call your doctor or midwife. They can generally alleviate your worries about being pregnant at three weeks.
What To Expect at 4 Weeks Pregnant