i am on the BC 'tilia' and i wanted to go on it for regularity, less cramping, shorter period, lighter period, and perhaps for slightly larger breasts. however, my birthcontrol doesnt do much for any of these except the volume of bloodflow from my period which is slightly lighter. i still experience painful cramping, long period duration, and same breast size. in addition, i have noticed that on the 4th week, when i start the brown pills, my period doesnt always start the same day, sometimes it is the first, second, or third day. is this all normal? should i go on a different pill?