Don't know your stats exactly, but dropping 4 pounds in a single month sounds great!
Eleven months in for me now, currently at 10mg, and I've only managed about 5 pounds over the last quarter (roughly 18% total gone, still chasing another 15%). After that opening month, the target's usually framed as 2% monthly, not raw pounds or kilos. Mine's barely hitting 1.4%, but since the overall line keeps heading down I really can't complain much. Worth checking with your provider on realistic timelines.