Supply/Letdown/Change in Milk with Cycle Returning?

Would it be likely that your supply or letdown is impacted with AF returning for the first time post partum? Or would the BM change in flavour perhaps?

My cycle returned yesterday (very lightly) and DD is literally attacking my breasts seemingly trying to generate a better letdown and supply, she is on and off like a madwoman and has been very unsettled today (barely slept unless in my arms), cranky and seemingly on and off the boob all day

Finally she's asleep for the night - but could AF be the reason? It seems nothing else is the likely culprit

Absolutely could be AF returning - many mums find something changes in their milk, likely the hormones affecting the taste, when their cycle returns. Let her do her thing, she'll adjust and work it out :)