I have been on ww since the end of aug and had a similar experience, some weeks no loss at all and others just a small amt. Then someone suggested I try the 'wendie plan'. it is the same amt of points but you mix them up during the week so you don't have the same number of pts each week. So far it has been a sucess for me.
If you go to the main ww page and scroll down you will see a thread for the wendie plan. or just google it.
it might be the break through you need
Goal one 10lbs by Thanksgiving --
missed met Dec 5
Goal two 15lbs by January one --
Goal three 20lb by Feb 21, 2017 -- January 23
Goal four 25lb by Feb 21, 2017 (spouses birthday) -- March 5
Goal five 30 lb by March 20, 2017--well it was wishful thinking...still waiting
Goal six goal weight by July 2017
Maintenance August 2017....sheesh that will be so much harder