Cycle is usually 30 days, but I haven't had one regular cycle since DS.

AF came back when DS was 9 months old & was 6 - 8 weeks apart for 3 cycles. Then I got the depo & that stopped everything for that 3 months. Then I think I had 1 30 day cycle, then the 23 days.
It was a little bit more than spotting, but lasted less than 2 days. Definetely not as heavy as normal AF.

And I've heard alot of babies wean due to the supply drop when pg.