Confusing results

Demi

I was late last month by eight days and my period was light and a little cramping but nothing serious enough for painkillers, this month I have been feeling overly tired and my period was six days late I done a few test and the clear blue one looks positive but this morning I started to bleed slightly heavy but no clots or period pains or other pms symptoms so I'm not sure what is going on some one please help !!!