What does a super light period mean?

Rachel
I don't even need a tampon. It's day 5 and it's been mostly increasing spotting then peeing red blood. 
I wish it were a baby but I didn't have much sex this month . . . 
My periods were also irregular and super heavy for about two years and just got back to 26 days aligned mostly with the new moon for the past two months. 
Any ideas what this is?