My fiancé and I are planning a small destination wedding in southern California in January 2020. Our families live in different states and we live in a third, so one side of the family or the other would have to travel (probably by plane) for the wedding. Since my fiancé and I regularly vacation in a certain spot in CA and got engaged there, we thought it made the most diplomatic sense to host the wedding in "neutral" territory that was also a nice vacation destination. Everyone is on board with this idea.
However, after we booked the venue, my future sister-in-law asked if we would reconsider the date since she is trying to get pregnant. She's worried she'll be pregnant by then and unable to travel when the time comes. Their parents seem to agree with this idea and want us to move the date.
I have mixed feelings about this; we want her to be able to take part, either as a bridesmaid or guest (whatever makes her most comfortable), but are hesitant to move the wedding date. To me, there are a lot of unknowns about the situation since she isn't yet pregnant (and has been trying for a while without success, unfortunately). What if she doesn't get pregnant by that time and asks us to move it again? We told her we're okay with her not attending if she is pregnant and unable/unwilling to travel when the time comes, but it seems his parents and sister aren't thrilled with this idea.
My fiancé and I want to start off on the right foot in joining our families together. How should we proceed? I have read a lot of advice columns about BMs who are pregnant, but what is standard protocol when the BM isn't pregnant yet? Are there any pieces of advice out there I can reference?
Thanks!