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As you begin to monitor your baby week by week during pregnancy, you'll start to notice specific changes. During your baby's fourth week of development, you may have just begun to suspect that you are pregnant. This is an important week for fetal growth because implantation occurs, and the embryo that will become your baby is beginning to change and grow. You may notice spots of blood, and this is due to the implantation. It is also normal. If you have any concerns, however, contact your doctor.