I has a couple of heavy ones after DD2 but mostly they were light and patchy. A bit later, I had medical treatment which affected my hormones, and my cycles were longer and the periods were horrors. The dr explained it can happen when you don't ovulate, the lining keeps building up and up, and then there's a lot to shed. I was at the extreme end for a bit, flooding through multiple pads/tampons in an hour, but the dr gave me some tablets which slow it right down. Ladies you might want to ask about them too, they are called cyklokapron, and they work in the clotting factor so that the lining comes away but you bleed less overall.

If it doesn't settle down in the next cycle or so, definitely see your dr to check everything is ok.