Re: missed period
What were your periods like before you started the pill? Were they irregular or did you skip any? The pill makes your period regular, if you had irregular periods before your body should naturally go back to what they were.
Also, your body may still be trying to adjust to not being told when to get your period. Go see your doctor again and express your concerns to him, but try not to stress too much.
At the end of the game.. The king and the pawn go into the same box.