Crohn's Disease

Am 32 years old,had Crohn's disease since age 12 for the past 10 years i have been doing remicade and 50mg of 6mp,after my last colonoscopy my Dr suggested from the results that we try coming off the 6mp.It has been 8 weeks and I do not feel sick or any different but I have gained 10 pounds all in my stomach.I look like I could be 2 or 3 months pregnant.I would like to know if this has happened to anyone else you came off of this drug after such a long period of time.
Thank you