It's normal. Normally there is a saying that when you feed ur baby... periods are delayed. depends frm 2-11 mnths

I had baby via vaginal birth

If you have had a baby via c section then post partum bleeding is very light and lasts for just a few days. At times by the time you are discharged it may have stopped completely. For a breast feeding mom the periods may return when you stop breast feeding.

but I Dint have postpartum bleeding also

Its normal. I also delivered baby on 24 august and still don't get period..