Periods after loss

Jade • Expecting a rainbow baby on 8/18/17 💙💜🌈
I delivered early at 19w on 3/31/16. I started my period again after maybe 6 weeks or so. Each period since has been getting worse and worse. I was always very light and only lasting a few days. But since my pregnancy they last weeks and are extremely heavy. Is this normal? I never had issues after my 3 normal deliveries with my older kids so I'm so confused now.