Hello. Welcome to hcm.
No periods is common as our body has to adjust to the fact that pregnancy
period is over and menstruation
should start. Many females start having periods by 3-6months but some have delayed periods. If you had no complications during delivery like bleeding or if D and C was done for any reason,then there is no need for worry.
I advice you to get a ultrasound
pelvis done after getting examined by your doctor. Harmone levels like FSH,LH can be estimated to know if the cause for delay is with harmones or if body is not reacting to these harmones and treated accordingly.
All the best