Regulating periods postpartum, help?

Firrrrst of all, why TF doesn't anyone mention how awful your periods become after having a baby? Like damn, I'm tired, crampy, damn near bleeding out, want to eat all the chocolate and then cry about it.

but I digress....

How long did it take for your periods to be regular after having a baby? I'm trying to practice NFP, we're currently using condoms but it'd be nice if in the future I could just track my cycles and know when I was ovulating. Just had a baby in March and right now my cycles are looking like 4 days off. I'm not breastfeeding.