Mine didn't come back for a very long time, but I don't know whether that was bf related or because I went on cerazette when he was about 12 weeks old, and one of the common side effects of that can be that you don't have any periods.
I definitely think I have a dip in supply around the time of my period - my son is 2y 8m now and during my period his feeds are shorter and he's more distracted, and sometimes says 'milk gone?', and then when it ends he feeds for much longer and seems satisfied again.