How to control weight in pregnancy? ?

this is my first baby...i am 29 weeks pregnany i have gained 18 kgs i have stopped taking fatty foodsand started taking 2 fruits per day and drinking 2lts of water ...frm my 15th week ... but still im gaining and i got done all the tests which r normal..what i shuld do to control my weight? and im 5feet 7inches height 94 kgs....