Could go either way, mate!
I reckon your body is deciding for you what you can handle when you're exclusively Bfing, or Bfing on demand.
For me, I'm still not preggers and got my AF back last September, DS was more than 2yo.
My GF's son is now 8 months old and she's due in September - she's a booby mama for sure and she got her AF back after about 2 months - cosleeping, baby wearing, feeding through the night...
So, if you want to roll with the punches and trust that your body knows better than you, go with it. Otherwise, look into contraceptive options