How Can Birth Control Pills Be Started To Induce A Period?

Hi. i am seriously worried. i didnt have a period for 6 months 2 years ago and i had insurence back then. i started birth control last year and had a regular period. i am now 21 i lost my insurence and i need to be on birth control. How do i go about getting birth control with no insurence? i really need it to have a period. i havnt had a period since december what do i do?