Hi everyone, thank you for your comments, even if some seemed unnecessarily harsh!
I thought I might add some context for the reasoning behind my worries:
My partner and I both have minimal families; it will just be both of our parents at the wedding, and even then, we don't have the best of relationships with them. That has meant that we have found the process of telling people we are engaged and planning the wedding to be quite difficult as we've not had the love and support from our family, which we can see others have in our circles. I'm not somebody who usually gets attention, I normally fade into the background, an only child who never learnt how to speak up for herself, and so having spent so much time and money on this one day, I was excited to have just this one day which could be all about us.
My maid of honor has had the opposite upbringing to me, full of unconditional love from her family, and unlike me, can easily draw on the attention of others. So I guess I just feel that she will already get all the family support that I have missed out on, I really don't want her to take my one day away from me too. She can have every other day in eternity, but I just wanted this one day for myself (I didn't realise that for some people this is seen as a crime).
As a side note, I didn't realise the word 'announce' was so nuanced, so apologies for that. She has told me that she is waiting to tell people in person, and the next time they will see most people is at our wedding.