Just as an FYI: the pill does NOT work to correct or "regulate" cycles long-term.
In other words, it will only appear to do so while you are ON the pill. Once you go off it, it will not have "fixed" your menstrual cycles in any way.
It's normal for cycles to be irregular for the first few years of having them. And it's also normal for a woman's flow to vary.
So, be sure in looking to "correct" something, that it really needs be corrected. The pill carries it's own risks, and has negatives as well as positives. An irregular cycle won't harm you in any way.
Editor and Founder, Scarleteen
"If you're a bird, be an early early bird --
But if you're a worm, sleep late." - Shel Silverstein