With my first who nursed quite frequently until she was two, my cycles took about that same amount of time to regulate and return to fertile. I was getting AF since 8 months pp, but my LP was not of a fertile length. Once she nightweaned at age 2 and then started decreasing her nursing sessions, my LP shot back up and I m/c once and then conceived 2 cycles later.Â
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With my second, AF returned a little later- 12 months pp- but they were immediately fertile as I got a shocking BFP just one cycle later. We were not at all trying as this is not child spacing that I would choose. Ds is 15 months and I am in the throws of m/s, which he does not understand. He wants to nurse all the time and let me tell you, it is SO SO painful. So painful that I want to wean, but the thought of weaning him when he's not at all ready makes me want to cry. I think that my milk supply has reduced slightly, but nothing serious yet, though I hear it can happen slowly over the pregnancy. For me, that would be okay, b/c it might encourage him to wean gradually before the new baby comes. Otherwise I'll have to consider tandem nursing!
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Good luck with your decision!