It's funny you mention that. I don't know if this will help you, but i've been on the same pill for 5 years now and I too have gained a lot of extra weight that I did not need nor want. I've been gaining a consistent 5lbs every year i've been on the pill. I too have been exercising and watching what I eat but to no avail. It seems like the healthier I try to be the bigger I get. I have gone from 154lbs to 180lbs, and it wasn't until recently that I had begun to suspect the pill. When I go for my next check-up i'm going to ask to switch pills, it seems like the only thing to do, but i'm kinda worried, because I don't want the next pill to add on more weight. My suggestion to you is to try to be as healthy as possible for your own good, and as for the pill, you have to make the decision to live with it or change it, but feel comforted that someone is also going through the same thing. I would love to set up a poll to see which pills cause weight loss, and which don't.
I wish you luck with your decision, and keep me posted on what you find out, for I am also curious.