Mazel tov! There is a custom to recite the entire book of Tehillim on your wedding day, so reciting it in the few days before would also seem to be a good idea.
In addition, some have the practice (not just before weddings — all the time) of constantly reciting certain pesukim having to do with bitachon (such as Tehillim 84:12, the recitation of which is mentioned in the Yerushalmi (Berachos 5:1).)