Hi! Thanks for being a responsible mom! I'm sure your daughter appreciates you. Definitely the first couple of months on birth control pills can be an adjustment and this could be break through bleeding and irregular bleeding as you suspect. That would be my guess as well. I'd give it another two cycles to see if it evens out. It likely will. If not, I'd talk to her doctor. Is she on traditional 28 day pill packs? These are the least likely type to have break through bleeding past the first couple of months.