yea i wouldnt say you will have to much trouble in getting another 1. it normally takes around 4 months to order one in. contact the place you got your dresses and see what they say but i dont see them having a problem!!
It might console you to know I'm getting married the week before you and haven't even looked for BM dresses yet!!
I'm getting Dessy BM dresses & they only take 4 months so you've plenty of time still!!
Not sure where or what I'm getting yet, but I think it's a faster turnaround for bridesmaid dresses than it is for bridal.
I have 4 bridesmaids and wont get them all together to have a look til Christmas...