Work through your probation period while you apply else where, if you find something better by then you have the option to not join this company.

If you make your intentions known now to this company, they will just throw you out on ur arse and you wont have anything in hand.

Also you might want to remove your pretty picture from your avatar, so people who might be working in your company dont recognize you and to save you from mass PM's you might already be getting.