Yeah, that's pretty shallow bullshit. If I had a friend ask me not to get pregnant in the year before her wedding and I was married and we were ready for something like that, well she can kiss my ass. I'm not putting my life on hold for one day in a million in her life--just think if all your friends did that? You could be barren for 5 or 6 years while they all are getting hitched
. I think it's enough to ask the bridesmaids to get their own dresses altered if they can't fit into it and are still in the party by the wedding day. Better yet start seeing it as one day in the rest of your life and just look at it for the emotional enjoyment of sharing something special with friends and family.