Hi Hockie Chick, I am on Kariva (its generic for Mercette). I have only been on it for a few days but I like it so far - I still have a couple of months to really see how my body is going to react to it though. I am not sure if its what you are looking for but when I did my research on it (some of it scary - but it seems all research is scary for birth controls) there was little about weight gain. I hope I helped...