Great start Sarah, well done! It will get easier from now on, and I'm not even that grumpy now (hubby might think differently though!) Almost a stone in a week, that must feel good!
As Sonkie said, do your measurements, some weeks you might not lose so many lbs but the inches melt off. I have lost 5" from my bust, 7" off my waist, and 8" off my hips in 4 weeks - that really helps the motivation, I can tell you!
Lots of luck for week 2!