Five weeks post partum - bleeding - is it normal? Need some advice.

Is it normal to still have bright red bleeding & cramping 5 weeks post partum??

Background:

So I had my baby girl in late July....and I actually had a super easy delivery and because of this I was expecting an easy recovery. I stayed active my entire pregnancy (I'm already back to pre pregnancy weight), I didn't tear, and my baby girl was small. At 3 weeks post partum I was still bleeding heavily - not a pad an hour - but a lot and it was bright red. I was also having bad cramping and pain in my vagina. I ended up seeing an OBGYN (not my typical doctor) and they gave me a 5 day prescription for a medication that helps contract your uterus. The medicine did make me feel better and the bleeding slowed down. I went back to the doctor a week later and saw my regular OBGYN. At the appointment (4 weeks and a few days), my bleeding had slowed down & my doctor gave me the go ahead for sex, exercise and everything else (I was somewhat surprised by this and made a personal decision that I was going to wait until 6 weeks). I mentioned I was interested in the IUD and he said they would do an ultrasound to check my uterus when I come in for that placement in a few weeks. Now I'm 5 weeks post partum and today I've been bleeding bright red (a lot - once again not a pad at hour but maybe a pad every 3 hours). I am also having bad cramping. Is it normal to still have this going on 5 weeks post partum? Has anyone else experienced this? I am EBF so I'm 99% sure this isn't my period. I don't want to be the person that keeps calling the doctor over and over for no reason :(