Weight gain on lighter life?

Am in my 2nd week on LL and have stuck to it religiously but think i have put weight on. I lost 9lbs in 1st week, (5 at initial stop in and 4 more at end of 1st week) but not due for my next one for couple of days, and my scale seems to say I am up 3lbs! I know their scales are the ones to go by, but mine are digital pretty expensive ones, and have been accurate so far as have weighted myself when come back from LL weigh ins just to check before.
Has this happened to anyone else? Am absolutely terrified that my body has gone into shock and I have wrecked my metabolism altogether!
Please help anyone!!!
Thanks.