hi Ziela, it depends if you're still breastfeeding. I've got a friend who was breastfeeding for 1 year and didn't get her period until 11 months later. Breastfeeding can indeed screw up your hormones and cause delay in your period. For me, I didn't breastfeed that long and opt for formula. And my period came in 3rd month after giving birth. so do not worry too much as your body will adjust itself.
I still pump my milk but recently just got my menses. 6 mths pp at that pt btw.