Personally, I wouldn't worry about it. I mean, heck, look at biggest loser, two pounds a week would be LOW for them. Everyone has something different to say on the subject. Some doctors say it's fine while others say it's not. I think it's all up to your body and how your body handles weight loss. For you, it might be normal to have this big weight loss two weeks in a row.
For me, normal is that the first week I lose a lot (this time around it was 6 lbs). The second week I gain back a pound or two. Then, by the third week, my body stabilizes a bit and I start to lose at a more normal rate. For me, that's usually anywhere from 1.5 to 2 lbs.
I say enjoy it. Stress can cause weight loss to stall