nellyrock31, how much water are you drinking every day? Water is key while taking phentermine, try to drink at least half your body weight. The water will help you with appetite suppression.
Also 7 pounds in 2 weeks is FANTASTIC! Weight loss is not a race, it's a journey and slow and steady always wins.
Do not compare yourself to others, every one is different. Your weight loss may slow down eventually anf there may be weeks you lose nothing.
Don't be discouraged, your doing great!