Period/cramping after miscarriage

Sadly, I miscarried at about 6 weeks on September 4th/5th (it was late at night) and passed everything naturally. I fully stopped bleeding Friday, September 11th. Today (Tuesday September 15th) I started having pretty bad period like cramping ( I have endometriosis so I get really bad periods and cramping). I feel as though I’m about to start, I have increased discharge, I’m extremely tired, I’m starting to cramp and overall, I just feel “blah”. I’m feel like this is very early and soon to start my period again but obviously, I’m not sure. I was just wondering if anyone had an experience like this or any insight. Thank you.