I know this is unhealthy but I'm not here for people to tell me not to do it...

Basically since starting the pill I've definitely gained weight. I gained 3 inches on my waist so I was just wondering how much weight would I lose if I hardly ate anything for 6 days. I know it's only a quick fix but I need to lose weight and slim down a few kilos before Thursday. After that I plan on doing an exercise routine etc.