Maxi dresses and empire waist styles are great choices! I found that anything that accentuates below the bust worked well for me too as it gave room for the bump and didn't restrict movement. Flowing, loose-fit tops/tunic-style shirts were my everyday go-to's and I found some nice ones with fun, bright patterns which made me feel cheerful - a pregnancy must!
I also loved playing up my look with accessories. Statement earrings and big sunglasses added a glam factor to any outfit and made me feel put together, especially on no-makeup days. For an extra fancy vibe, a cute shrug or lightweight jacket draped over the shoulders is a good idea - makes any outfit feel instantly more elegant.
What patterns/styles have you been reaching for? Any specific looks you're hoping to achieve during pregnancy?