Is the auction over?
Did someone else bid the same amount EARLIER than you did (their bid would be just above yours in the bid history, check the timestamp on that bid; any bids above that would be by the same bidder for more money but the full amount of each of those bids is hidden as only the lowest bid of the winner that is enough to beat the underbidder's highest bid, including an earlier tie amount, counts in determining the price)?
Is your bid still there on the main bid history list, or is it at the bottom among the cancelled/retracted bids?
Does the listing say "Reserve not met"? If so, no sale.
If one of the above doesn't answer your question, what is the item number so we can take a look at it.
If one of the above doesn't answer i
