How soon postpartum did you menstruate?

I had my baby 4 months ago and had quite an unusual healing period. I didnt stop bleeding till 8 weeks postpartum. Anyway, since then, i havent experienced a period, i took 2 pregnancy tests (both negative) and my husband got a vasectomy so i shouldnt be pregnant (i hope not ne way). But ne way, i was curious to know when other -feeding moms first menstruated post-partum.