And yes, it will slow down - week 2 you will definitely not lose 8lbs! About 6lbs of that loss was water weight (glucogen stores), a normal loss per week is between 1lbs-3lbs.
I do advise - that some weeks you may not lose any weight - but do not panic or become discouraged. Be prepared for 'stay-the-same' (STS) weeks - our bodies do not follow a clockwork mechanism. STS also happens on absitience LL, it's natural. Sometimes our bodies will want to hold on to the water, or have built up muck inside, or other things like that-time-of-the-month plays a part!