Relationship tension before wedding

Hi, everyone,
So, the big day is March 14, just a little over a month away. Over the last few weeks things have been difficult between my fiancé and I.
While we've been communicating any worries and how we are feeling, it's as if we are incapable of having filters, and suddenly it's like everything that comes out of our mouths is wrong. We normally aren't like this, and for me, it almost feels like I'm try to self-sabatoge. There's things I would normally just keep to myself that bother me, but aren't that big of a deal, but for some reason I will pick the worst possible time to bring it up. I was wondering if anyone else experienced anything similar before their wedding, maybe due to stress and the impending life-changing event. People keep asking me if I'm excited, I say, yes, but in all honesty, I couldn't feel further away from excited at the moment.