I agree with above posts. I wouldn't be excited about losing weight without a BM! I would be scared! The trash MUST go out - that's the whole point of the Master-Cleanse - cleansing. Nothing is getting cleansed if nothing is coming out. This can be VERY dangerous as the toxins are building up in your body!
No more PB shakes until BM's start coming; water, water, water (can't say that one enough), and yes to the SWF. Drink it warm and imagine it's extra-salty chicken broth! I hear the Celtic Sea Salt is the best tasting too and may help you.
I always used to "prime the pump" with 8-16 oz. of water before the SWF (Salt-Water-Flush) and it helped a ton! God bless and fast ON!