What Causes Weight Gain Around The Abdomen While On Contraceptive Pills?

Hello. I have recently gained 20 pounds in the past 4 months. I was 125 on 2/11/16 and I was 141 on 6/21/16. I don t eat much and eat healthy, exercise at lease 3 times a week and never have been a bigger person. I am holding all this weight in my stomach and its making me look pregnant and I know im not pregnant. On the pill continuous and have abstained from sex for almost a year. I have been to the dr before for this bloating but they say eat less, exercise more and too easy for them to say that. They didn t run any blood tests and I do have a hepatic hematomia on my liver. I am at my wits end and I would like some help. I am on a meal plan and supplements with Metabolic Research Center and I haven t had luck with this either. My stomach and thighs have got bigger and now I have rolls on my stomach. I have always been 115-125 pounds so this 140 weight is not ok for me.