My DD is still nursing at 15 months, too, but I got AF back at 4 weeks PP. I have had it pretty regluarly since, evem when she was sick, or nursing very frequently. I have never heard ofAF going away again, but I know that many women have a very irregular cycle after getting AF back. Mine used to be 28 days, but are now about 38 days, and fluctuate a lot. Sorry the witch is back!