I need some advice. I was two days late for my period and when it did show up it was like it wasn't even there. Usually my period is very heavy and last up to 7 days but this time it only lasted two days. And it was really only spotting. I have been nauseated, and my abdomen and lower back has been killing me lately especially when i am standing for a long time which usually doesn't happen because i work on my feet for a living. i am also getting bad headaches through out the day. I took a preg. test and it said negative but i know something is wrong. My body is never like this. What should i do?