Postpartum period!!omg

Katie • My name is Kate and I just gave birth to our beautiful daughter February 17th 2016. She is our world and we couldn`t feel anymore blessed❤ I am currently pregnant with our July 2018 baby!
So I had my first one at 6ish weeks and it was very light lasting 5 days...I knew I'd be in for it when my next one came but,DAMN!it's no flow it's a flippen running faucet! I ruined our sheets / pair of pants/pair of underwear...the sheets being the only thing I care about but, I guess my question is how long can i expect to bleed this way? I'm on day 3 now and it's early yet but, I've been going all night with this! I didn't even have it this bad after I had my daughter...when do I call the doc? I also started to take some of my left over iron pills from after having baby too...figured it couldn't hurt me at this point. Any info would be great!!