My bad I must have confused you with someone else regarding the proviron.
I can't say for certain if you weight loss will slow down. That totally depends on your diet and training. I haven't weighed myself in a long time but regularly lose one percent of bf a week on a keto diet.
You definitely need a carb reload day because your body won't stay in ketosis forever. Eventually your body will begin breaking down muscle tissue for fuel if you don't replenish your glycogen storage.
These are the best two cyclical ketogenic references that I've come across.
The Cyclic Ketogenic Diet....
The Real Ketogenic Diet Calculator