Periods on birth control?

Taeler

Ive been on birth control for five months and still have irregular periods. I get my period during the week of taking the sugar pills but i also get it while taking the hormone pill (so i usually get it twice a month) does anyone else experience this? I get no cramps while on my period and i dont bleed extreme amounts now that im on birth control, but shouldnt my periods be on a schedule now that ive been on birth control for five months?