Help! BC & my cycle.

Karla
So my doctor put me on birth control in order to regulate my cycle for a few months with a 3 month goal of stopping the pills, having a normal cycle and hopefully getting pregnant (we have been trying for 2 yrs).
I started the birth control 3 weeks ago, according to my pills next Thursday would be my cycle. I have never been on birth control before.
I have never missed a pill and take my pill at the same time every morning. I just got my period and I am confused and concerned. 
Is this normal?
Which pill do I take in the morning? 
Thank you in advance!