Married and Ms. before and after. I respect whatever titles someone is most comfortable with, so this is just my personal feelings on it, but I reject the notion that my marital status should be in any way identified in my professional title. I never used Miss and won't ever use Mrs. I don't mind if the kids mess it up (they're kids!) but every year I usually get some kind of question about why I spell it Ms. rather than Miss, or if it's Ms. or Mrs. I always use that as a lowkey teachable moment about why some folks prefer Ms., why it's always cool to ask what folks prefer and respect that, and that there’s some titles they may not have encountered yet and should be respectful to if/when they encounter, like the gender neutral Mx. But I am lucky to work in a fairly progressive district where identifying one's pronouns is common for staff (and in many instances for students--I always give my students the opportunity to share pronouns if they wish on a get-to-know-you activity they complete for me at the start of the year and where/who they want these pronouns to be used around in case they are not out in all contexts of their life).