This sounds exactly like me! I have always been extremely regular, 5 days, light bleeding, no cramping, and then I started my period back after my son. My first period lasted 6 weeks, I cramped every single day, and I was extremely heavy. I regulated out a little bit, but last May had another 6 week period, very heavy, and lots of cramping. My doctor gave me a prescription for progesterone for a few days to flush out my system. After that, I was supposed to go on the pill for three months to see if I regulated out. After the progesterone, I could tell an immediate change, I stopped bleeding and stopped cramping. I took the pill for a month, and haven't taken it since and my cycle is back to normal. Sometimes your cycle is going to change after a baby, but I would still go to your doctor to have it checked out, just to see if there is something going on. Good luck!