TMI: Period after birth?

Okay so I've never posted about something like this before but I'm kinda freaked. So I had my son 6 weeks ago, stopped breastfeeding about 1 1/2 weeks ago due to having a difficult time with supply. (I had a very hard time deciding to stop) this past Sunday I noticed spotting, then Monday period like cramps and bleeding. Today I'm having heavy bleeding. So I'm convinced its a period, however there is an aweful smell when I go the bathroom and have to change pads (I haven't been to my 6 week postpartum appt yet so not sure if I'm allowed tampons) Any idea what this all could be?