I had a c-section 12 weeks ago. I bled for almost 6. Stopped bleeding for almost 4 then got my period heavy and crampy for a week then for the next week bled on and off.
I stopped bleeding for 4 days and after some stomach exercises last night I'm bleeding again and have pains.
It's probably a good idea to get checked out by the doctor just in case. I bled on and off after my c-section for about 8 weeks, but I never went more than a few days before starting again. With my daughter I bled on and off for 11 weeks and again only a few days in between when I stopped. I'm not sure why you would be bleeding so much after having stopped for 4 weeks.