I've been on the pill for over a year and I thought I'd be able to skip my period when we went down in October by taking two months consecutively with no placebo. It didn't work for me - not sure if it was because I'm on a low dose, or because of all the stress my body was under at the time, but I wound up getting the worst period I've ever had - it lasted 13 days!!!
Just be aware that sometimes it takes a month for your body to recognize that you're on the pill, so you might get your period anyway.