Nature has designed birth simply and elegantly. Although every labor and birth is unique, and your labor will unfold in a very special way, the process is remarkably and beautifully constant. What follows are the typical changes that occur throughout the stages and phases of labor.
Your Labor Guide- http://www.ivillage.com/your-labor-guide/6-a-144645 
BTDT ladies, with your previous pregnancies, how did you know that you were really in labor? What signs did you notice that made you realize this was really *it*?