Are irregular periods a sign of infertility?

Hello Dr
I got delivere4 months back but still have not got my period is it normal ?

Are irregular periods normal?

My sister's period is late but she is not pregnant.. Why does it happens ?

What should be done to get regular periods..

Before pregnancy also i use to not have regular periods , will it have any side effects on the baby.

Can gaining weight must be the reason for the irregular in periods

Are irregular periods a sign of infertility?

What can be done for irregular periods

What does it mean if you have missed your periods but you are not pregnant?

at what intervals should i get an ultrasound test done to check for cysts?

how do I manage my PCOS without medication? i only have mild acne

Sir 10 ki date h but av tk baby ne head doun ni kiya h kya karen

What does if u hv missed your period but you are not pregnant/ conceived