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.