Any advice? (Bridesmaid dress)

Michaela💜 • Wife to an amazing man❤️ Mother to a beautiful baby girl 1-30-2020 and two angels gone too soon 👼 6-23-22👼12-09-22

I’m currently 6 months pregnant and I’m going to be in my brothers wedding as a bridesmaid at 3-4 months postpartum. I’m supposed to order my dress by the end of this month but I’m not sure what size to order at this point. Any advice?