Scared on birth control?

i been on birthcontrol for about a moth but i didnt want to do it no more so got off them i stop takin them for about 4 days *mind u it was only my 1st week into a new pack. but anyways i didnt take them for 4days and i just got my period is somthing wrong like why did i get my period early is it bcuz of the birth control orr ?? kinda scared need sum help..!!