2 days ago my period came. Then as soon as it came it left. Today it was completely gone. NOt to mention I woke up with a sore stomach, almost as if I had done one to many sit ups the night before, which I had not. I also noticed my breasts were a little tender yesterday but are no longer as sensitive. I also have a slight amount of back pain, nothing really bad. It just feels sore. I was also feeling a little nausea this past week. Im wondering what is going on. Can you please help me out.