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If you have not already found out that you are pregnant, you probably will this month. It is usually best to wait until you have missed your period to take a pregnancy test. As early as this week, the plate that will become the heart has developed. The babies' brain, spinal cord, muscles, and bone formation are also beginning to form. The baby's skeleton is forming at this time as well. The embryos have a distinct organization that has a top, bottom, left, right, front and back. It is important that you continue or begin to take your prenatal vitamins to prevent birth defects. At six weeks, the embryos are about the size of raisins. Towards the end of this month, all of your babies will have visible facial features and their eyes have a retina and a lens.