weight gain

has anyone else had trouble coping with weight gain, I'm barely in my 4th month and already gained 10 pounds, I'm very paranoid about my weight but with this pregnancy it's like the moment I found out I was pregnant I swelled up... I'm eating super healthy and going for walks at least 4 times a week, I drink tons of water and no sodas and I'm still gaining tons of weight.. my self esteem is at it's lowest and I honestly think I'm becoming depressed.. sorry I'm venting .. anyone else have any advise...