We booked our wedding a few months a go, and just recently my oldest sister announced that she is pregnant and is due a few days before the wedding. I knew she was going to be trying to conceive, but I thought she would plan it so she had the baby after the wedding, not just before! She was meant to be one of my bridesmaids, but has said she wont be able to be one now and might not even be able to come. Should I change the date? The only available date left at the venue is in June, and there is no guarantee that the other companies we have booked will be available then. At the moment our wedding day is going to be on my mums birthday (September) which has been gorgeous weather for the last three years. Also my OH's bestman is coming from another country so there is no guarantee that he will be able to come if we moved the date earlier.
Any opinions? What would you do in my position?