How quickly did you get pregnant with subsequent children when still breastfeeding your first (or second etc)?

Haven't managed to get my 17 month old toddler off the breast yet (at night time), despite our best efforts. 
We got pregnant with him on our first try, but this time we are now in our 5th month of trying with no luck yet.
Periods returned when he was 10 months old, but they are irregular. 

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