WotLK Lost coins?

Hi, first of all, im from Spain so sorry if i make mistakes on the writting. Last night i tried to sold like 18k gold on Lordaeron realm for about 45 coins in the trade section. I posted the sale and i could find my sale on the trade section. This morning i checked if everything was ok, but my sell is no longer on the trade page, and i have not recived any coins. Do u know guys if i have to wait a few hours or somthing?(in case the gold was sold) or maybe i just can see my own sale?