birth control
"I started taking Microgestin 1/20 a year ago after my insurance quit covering Ortho Tri Cyclen Lo, which I had no issues with. I've tried other birth control pills in the past with side effects like acne or headaches and didn't want any of that, I told my ob/gyn, just something comparable to Ortho TriCyclen Lo. 
I rapidly started gaining weight shortly after starting the pills - up five pants sizes since then with no other changes in lifestyle - I have tried exercising even more, and ate relatively healthy before but tried harder on that and portions also, but have not lost an ounce. My husband has exercised with me and eaten the same meals, larger portions, and has lost weight. So I am thinking it is the Microgestin."