With my first it was probably just as bad but it only lasted the first 2 days then started getting lights and lasted just over a week. With my second PP period it wasn't as bad as the first but I still couldn't use tampons because it was so heavy.
Try getting on BC if you aren't already. My first PP period after my baby was born was super light and I was on the mini pill. I stopped taking it and what I perceive to be my 2nd period(neg HPT) was just spotting for 5 days.
However if you are concerned it is a lot of blood talk to your doctor.