We get results from Riot's API every 10-20 minutes for the ladder so your score will most likely update soon. If more time has passed, there could be a temporary issue with the connection which will resolve itself if you just wait a little longer!
If you still haven't gotten any scores after more than an hour, you are recommended to double-check the match result on op.gg to verify that it is has been reported there.
If they have the result but we don't it is very likely a result of you joining the game in League of Legends before you joined the Ladder. This may then cause the ladder to not recognize your game. Make sure to join the ladder before you enter the League of Legends Solo Queue.