Love the dress. Material is amazing and it drapes so pretty.
I'm 5'6" and 165lbs and ordered a Medium. I'm also currently 12 weeks pregnant.
I have smaller boobs so I have to really squeeze the dress on me if I don't want big gapes in my cleavage (doesn't help that I have a wider rib cage too). A little snug on my shoulders but I would not size up just cuz my small boobs lol.