break threw bleeding!!!

ive been on the pill for about 5mnths now and the past 2 mnths i keep having break threw bleeding so i get my period twice in the month for a wk at a time went to the doctors and she change my pill but now im on ny 13th day of bleeding and im just so over it but not many other contraceptives agree with my body just wanna k ow if anyone else has had this happen to them and what they did.