at the time i would have period if i were not on pill (i know this from when i was off it trying for dd) and then again when ive finished my pack of pills!?...NOW (still taking pill, but 'would' be on if i wasnt taking them is killing me!..really bad back ache, bloated, cramps, slight discharge..then will happen again at end of pack!..can i do anything about this? (coming off pill not an option!)