possible pregnancy symptoms?

Jordan

so AF arrived (so I thought) 2 days early, it was lighter than usual and only lasted 2 days at the most. I have been feeling like garbage for the last few days (cramping, tiredness, headaches, diarrhea, and extream lightheadedness). we have been ttc for a few months now but I keep getting negitives... my back hurts but that is not unusual... thoughts as to what could be happening?