Congratulations!
4.4 pounds the first week is awesome! Did you realize you've already lost 10% of your goal?
Phase 1 weight loss is largely water, so once it's gone you won't be repeating that every week. Everyone is different, and I have quite a bit more to lose than you, but I've had a nice steady weight loss averaging about 1.5 pounds per week while on the beach, which is a good healthy amount. I've had 3 or 4 weeks (in a row!) when I stalled and a couple of weeks where I gained a pound, but (eventually) those times seem to have been followed by a whoosh of a few pounds.
I've done Phase 1 3 times now and have lost more during the first week of Phase 1 than in the second week, but have lost a pound or two the second week.
It feels good when the scale is moving down, but try not to allow yourself to be ruled those numbers... sometimes it cooperates, but often times it doesn't, when it isn't just keep plugging along and it'll catch up to you... even if it feels as though it never will.