HI Emma,
I was also on the pill for over 10 years and often skipped periods because of my sport. My doctor was aware of the fact and atually said that it does not have any major side effects and can reduce things like anemia and low iron levels. I stopped taking the pill in June and pretty much have had normally cycles ever since (29 days). Looking at TTC in december so will let you know how that part goes!!

Good luck