My guess is you are totally ok. Your fermentation us still taking place I would believe, it just might not look like it. Pitching on a cake can often cause huge early Krausen and blow offs then slow. Let it sit for a week and then take a gravity reading to see where it is at. You can also agitate the yeast by shaking your fementer if your yeast has fallen, but I doubt you'll need to.
Just let it sit for a while, I bet you'll be good!
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