How long did MC bleeding last?

I went to the doctor on aug. 19, hcg levels had dropped by half and there was nothing in my uterus. Something 'concerning' in my tube but no baby. No major cramps or lots of blood or anything. The thing is, I'm STILL bleeding...it's not a lot but it's not a small amount either. It goes back and forth from brown to red with some 'tissue' like stuff. Has anyone else exp. this? I called the doctor and she says it can be normal to bleed up to 4weeks. But they said I wasn't that far along so I didn't expect to bleed for this long either. As bad as it sounds, I just want to get back to normal. :/