I started out at the same BMI (maybe 37). I had my RNY August 11 (a little over 3 weeks ago) and have lost 30 pounds as of this morning. Of course, the first 10 were due to the preop diet. My doctor told me since I wasn't as heavy as most who have the surgery, I wouldn't have a 30 pound weight loss month, but it looks like I'm going to be close. If I had to guess, I'd say you would probably lose 40-45 pounds by December if you do everything correctly and exercise. Good luck and congrats on your wedding!