BC periods

I am 2 months PP and I started birth control at 6 weeks PP... I should be getting my period tomorrow (according to the pills), my question is, how many of you didnt get your first period even being on Birth Control pills??

I am just so nervous that my period wont come, then I will be afraid I am pregnant, so I just want to know how common it is for you not to get one rigth away... And after how many months of birth control did you get your period?

I didn't get it when I took the white pills but I got it a few days after when I had already started my new pack...