Personally with my m/c on 9/28 it took 32 days for my 1st AF and I didn't have any breakthrough bleeding. With this m/c I am still waiting so we'll see. I know I have read many posts on here and there are quite a few girls who had breakthough bleeding and then it stopped and they still got AF around the time when it was to be expected. The irritating thing is that nothing and everything is normal after a m/c.