My periods returned about 7 weeks after birth I think. Had just stopped the post-birth bleeding and the wacko - first period. I've had them every three -four weeks since. Not happy at all about it. Doesn't affect my supply at all but is really really really really (is that enough really's?) painful to BF the week before the bleeding. Bub is exclusive BF too, and feeds really often so there is no reason they should be back, except maybe I'm just super fertile.