Can I expect a fine for driving in the wrong turn into a one-way street

Has anyone been penalised for driving on a one-way street in Brussels? This evening I mistakenly took the wrong turn into a one-way street close to Rue de Tongre (Merode). The street was quiet and there was no traffic, but I realised that I was on a one-way street only at the end of the street. I don't know if there are cameras or the police has seen me, but I am wondering what I should be expecting. Thanks.