Why is this happening??

Lucille

So I stopped breast feeding my son almost 7 months ago after my supply completely dropped. Since then I've been able to barely get a drop occasionally, until this past week. I started getting random let down sensations at first, then a few days ago I started leaking again. It started as very yellow/sticky colostrum, and then transitioned to milk. I was able to hand express almost a full ounce total between both of them last night. Has anyone had this happen or know why this might be happening? I have been TTC for a few months, could it possibly be an early sign?