Periods for burth?

Kourtney • Kourtneys the name,Matoaca,18, don't like fake people, small town country girl😈, getting dirty is fun😏
So I just started my birth control this month and I was getting a period 2-3 times a month before taking it and now I just started and this is my 3rd period since I started..  I  that normal or should I change my birth control!!