What could this be?!

Abigail
So I thought I was pregnant considering my  LMP was Sept 5 and didn't have no signs of it coming and I've had unprotected sex a lot since my last LMP. I did test twice and got negatives about a week ago. 
I went to the bathroom just now and as I wiped there was blood. Not enough to stain my underwear or anything. I do have a slight headache..
What could this be? Do I count this as a period?