I have used a hell of a lot of DNP over the course of my life, and it seems to lose a little potency with time. I still get great results with it, but the first few runs of it were amazing.
I never bother weighing myself or even looking in the mirror until I am off DNP for at least 10 days, more like 2 weeks. I sometimes gain weight while on it (from the water retention), and I will hold water in a perfect circle around my waist, love handles, and lower back. That and the overall flatness it causes in the muscles makes for a pretty lousy look while you are on the drug.
Once the water comes out (10-14 days later), my physique takes on a whole new look. You really have to give it time to see the results IME.