Birth control and menstral cycle?

I had remarkably irregular periods adjectives of my life and to oblige control them, I started birth control a two months ago. The doctor told me that it may take a couple months to procure my period right on the dot, but at the end of my first pack of pills, I get my period right when it be due. Now, however, I got to the wind up of my second pack, and I'm on my third sugar pill and still haven't gotten my period. Is it common that my period still could steal more time to regulate?!!? I'm just a short time worried... Thanks guys!
Answers:

Do u feel gross after sex?

Give it a couple more months, if it hasn't worked by afterwards you might need to silver to another pill.
When you are on the pill, you don't ovulate so its not a real "period", your body may bear a little while to adjust.
The pill, immediately days is such a low dose, you might need to try a few until that time you find one that works for you.
At least you're not getting break threw bleeding surrounded by the month, that's a good sign that given time this one will work.
Good luck

Its a girly query!?

It took me a few months to get my cycle regular. Now it's regular, but I still don't start til in the order of the fourth day of sugar pills. So you may be commonplace, or I'm abnormal :)