D.N.
I had this happen. When my older ones were about 3 months old I was back on the pill and with the Obs approval skipped the last week and went straight to the next month, figuring to skip the cycle. I ended up with 15 days. I finally go to see gyne at 15th day of course and since it was stopped, no reason to do anything. But he did tell me that I just had the baby so hormones are still all over, nursing-again the hormones, and I started the pills different so my body was not quite sure what it wanted to do or what I wanted it to do. If it is really heavy, then I would go see the doc but if not super heavy and you feel fine, you could wait and see how much longer it goes.