Okay TTC while breastfeeding and also getting AF??

Cierra

My son is 16 months old and still very attached to the boob. My period stayed away for a good while, but came back once I weaned night feedings. I just assumed that change in feeding patterns allowed it to return. Anyway now we are TTC for baby #2 and not having good luck. I’m wondering if maybe even though I’m getting my period regularly, could breastfeeding still be acting as a “natural birth control”?