Christmas announcement

Ashley
Ladies!  We're planning to tell our parents and siblings the good news on Christmas, which will mean we are 12 weeks pregnant by that time.  Just have a question, and wondering for a little input!  
My brother-in-law is getting married 3 weeks after Christmas (destination wedding).  Do you think this news is too close to their wedding? And would you be upset? We're not trying to distract from their special time, if anything we wanted to tell at Christmas and not keep it a secret longer, as I thought if people figured it out while we were there (not drinking at an all inclusive is kinda telling, plus is be 15 was and showing by then I'm sure).  Just curious of others thoughts.