I went off the pill three months ago, for the first time in 15 years. The only major difference I experienced was ovular discharge cycles each month, which I actually think is the NEATEST thing because I don't remember experiencing it to this extent when I was a teen.

http://www.billings-centre.ab.ca/bc_701.htm

My first month off the pill was like any other except for the kicking in of the cycle, which started up without any struggle at all. :-) Bodies are so cool. Good luck and keep it safe!