Baby shower dress- when to buy?

Charlotte β€’ Wife πŸ’ stepmom πŸ‘Έ pibble mom 🐢🐢🐢 Kendal Grace Jan. 2019 πŸ‘£πŸΌ

We are having the shower next month on the 24th, the Saturday after Thanksgiving so my mom and stepdad can be here from out of town. I am currently 26 weeks and *sometimes* look prego but I'm more growing out from side-to-side instead of front-to-back. I was also a little chubby when I conceived.

I want to wear a flowy dress I found online but don't know if it'll look good in 5 weeks like I'm hoping. I am already self conscious about my belly because it just seems my fat is being pushed out instead of being taut like the cute bellies I see on here. This is also my first baby. I am currently 175 at 5'6". I also have no ass lol

This is me today:

I want a dress like this: