Newbie having no luck

Hi i just started 15mg 4 days ago, so far nothing seems to be happening still as hungry as i normally am trying to stick to healthy things, but no loss of appetite at all, also no extra energy, im 164cm 85kg so bmi is classed as obese, i asked the doc to start me off on the higher dose but she said no i take tablet first thing in morning about a hour before i have breakfast, am i doing summit wrong?