Tomorrow is the last day of Behab which is also Pesach Sheni, which creates a contradiction. On Pesach Sheni the minhag is not to say Tachanun, on Behab we add selichos. The luach in Israel quotes 2 minhagim one to say selichos and 1 to not say selichos. The shuls that I daven in have elected not to say selichos and observe Pesach Sheni.
Let me know if your shul says selichos tomorrow or not.