My son is almost 11 months old and I've managed to still breastfeed him. I cut down to nursing only in the morning and before bed top use up my massive storage of milk. Due to cutting down, I got my period back a few months ago. Right away, I was back to my pre-pregnancy, predictable cycle - every 4 and a half weeks on the dot. I just finished a cycle, and now 3 days later, I'm apparently starting another one. Waaaay uncharacteristic. Any thoughts on why this would be happening?