2nd thought after reading other moms' responses: cool, i wasn't aware that a lot of moms get their period so soon after. I, and all my mom-friends took at least 6 months. It's great if this is the simple and natural explanation! Sorry to have blown an unnessecary worried whistle... I just had this experience, and didn't get out of my shoes. Learnt something. Thanks all!
this would be astonishing. There is another possible explanation: there might be some "leftovers" (e.g. pieces of placenta, ...) in your uterus, that the uterus is trying to get rid of, which will result in weak to strong bleeding. A quick ultrasound will be able to show if this is the case. I had this after my second child, around 2 months post-partum. The first step was then to encourage uterus contractions (there is medication for that), but if that does not get the "leftovers" out, a curettage will have to be made. In fact, that is what i had to undergo. The procedure was short, but under total anesthesia, however, i did take my newborn with me and continued breastfeedng with no problem. (i did pump for one feeding, which she actually ended up rejecting). I hated to have to go through this, but in the end it was less bad then expected.
I guess i am saying: see a gynacologyst and have it checked! I would be glad to know what happened, so let us know if you can/want to.