I had my last period on jan 17,2007 and I was supposed to have it again feb 14, 2007 and it is now feb 20, 2007 and my period still hasn't came. I have taken a test and it showed up negative. I have all the symptoms I have the sore breast, the feeling sick to my stomach, the headaches, the increase in cervical discharge and the extream tiredness. I have had two children and I know the symptoms but why are the test saying negaitve.