What birth contol pill are you on? They all have different levels of hormones, which can somewhat affect your weight. In my experience, I was on the pill for a year (orthotricylclen) and when I stopped taking it I dropped from 110 to 100 in less than 3 weeks., without ANY changes to my exercise ot diet. Of course I was anorexic, and exercised way too much, but the point is that your birth control can make your body hold onto more weight, even when you're starving yourself. You can talk to your gyno about low-dose estrodiol hormone birth control pills (orthotricyclen is now only low). Also, do you have amenorhea (no menstration)?