Pregnancy symptoms?!!!

Mindy
Ok so I am due for my period middle of the week..Tuesday/ Wednesday. However I have had severe nausea for about 4 days. It lasts all day long. The only time I don't feel sick is when I sleep. I am fatigued and have some back ache. All I know is I have no appetite and feel like crap all day long. This morning I took a test and it was negative. I am just looking for some help? Thanks