Need to order bridesmaid dress...what size??

Kyla

I’ll be standing up in a wedding about 3 weeks after my due date and need to order the dress soon but do I order the size that fit me at try-on (8 weeks pregnant) or size up? The dress does have some stretch, but I’m worried about the boob area. On the other hand I don’t want it to be baggy because I won’t have time to get it altered before the wedding.

This is the dress: