Confused...

Jay
A little TMI.I have been spotting for the past 4-5 days. Blood mixed discharge. Should have started 3 days ago.Had period symptoms. Mold cramping, pinching a few inches on either side of belly button, nausea, had a headche today, light headed... No stress. Negative test yesterday evening. What could this be? And what should I do? Comments appreciated. :)