It sounds like it probably is your body telling you to slow down.
With my first, my bleeding stopped quickly - no probs. Then with my second it droned on then stopped then started then stopped and spotted, etc. This went on for 6-8 wks. and I wasn't doing too much. My mw said my body might be trying to start cycling again (I doubted it) and to start thinking about birth control. Well, 9 mos. later, I was pregnant again! I didn't even get my period back at 9 mos. with my first! I'd keep both possibilities in mind just in case!