I suggest you measure yourself ASAP Mazz, because if you are going to the gym you will be sculpting your muscles, and they weigh more than fat! Bugger it all!!!
So in the first few weeks, a lot of people actually gain a little weight, but in fact they look smaller because they have lost cm's. Maybe someone at the gym can do it for you, or you can get someone at home to measure you with a dress making tape. Just keep a record of your measurements and re-measure maybe a month later. And don't get too frustrated if the scales don't move. Its more important how your clothes feel! I wish you every success.