possibly pregnancy

I went thru a rough breakup recently (found out he cheated almost the whole 3 year relationship), i work full time, and I go to school full time. I've been having symptoms that could be pregnancy symptoms because I don't ever get menstrual symptoms. Minor cramps, sensitive breasts, nausea, increased discharge, and fatigue. I also spotted last week which never happens. My cycle is about 28-27 days (LIKE CLOCKWORK) and now it's day 30. I took a test and it came back negative. Could I still be pregnant? Or could my body just be tired?