The pot is empty. Your ante would be the first chip, and the first ante starts tonight's clock.
Nobody has taken a pot yet.
When a call closes, its draw block is fixed two blocks ahead. That block's hash picks one ante. Nobody chooses, and anyone can redo it from the block explorer.
That is its own 25,000 back plus 269,000 from the other eleven. Three antes in that call would have been three chips out of twelve: a one-in-four shot. A call that closes with one ante gives it back whole.