miscarriage?

Can a miscarriage have cramping that's tolerable and bleeding equivalent to a really heavy period or is it worse in both ways? I was pretty sure I was pregnant but it was too soon to test for it, my period or what I think is my period came early and it was super heavy all day until about now, I was changing pads every hour and there was a bit of tissue coming out too. Did I miscarry or is this just a really heavy period and was I not pregnant at all?