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It certainly CAN happen. Everyon'e cycle is different and it depends also on the frequency and amount that you're breastfeeding. Some moms, even when they exclusively bf on demand, get their period back early. And some of us go 15-16 months without it. It's highly variable. You'll want to make sure you're using some birth control if you don't want to get pregnant again. Once your cycles start up that potential exists.