SIL stealing exciting announcement

[Lbh4077]

Hi,
I'm at odds with husband on whether to tell families when I go into labour.
Little bit of a back story, when we found out we were pregnant, excited we told immediate family, asking them to keep it amongst themselves until we decided to tell friends and the rest of the family. Myself and my SIL run in the same circle of friends, so when the 12 weeks came around and we were comfortable to tell friends our exciting news, turns out SIL had already told them (I didn't find this out until a couple of weeks after). I feel I was justified in feeling put out by this information, but gritted my teeth against confronting her to keep peace.
So fast forward 6 months, with less than a week to go, I find myself not really wanting to let the family know when I go into labour, as I want us to be the ones to have the excitement of being able to spread our news to family and friends ourselves. My husband doesn't understand this he wants to be able to tell his parents and siblings as soon as it all starts. Just to be clear, I wouldn't be informing my family either.
The way I see it is if she's already crossed this line once, what's to stop her stealing our thunder again?

I know I should have bigger things on my mind than this, but after arguing with hubby over it, It's made me feel as though my concerns are trivial.
I just need some unbiased perspectives on the situation 😊

This would piss me off!
With my first pregnancy I text my mum and dad (separated) after I had got to the hospital and had been labouring for a little while just to say hi just to let you know I'm in labour, I will update you when he's here safely.. I don't know if they told anyone I can't remember but then it was close to midnight when I text so chances are they didn't get the message until the morning anyway. (Also I don't actually know why I did this, maybe cause first grand child or just incase something happened to me, again nothing they could have done but there we go).
This time however I'm expecting twins and as excited as mine and my partners families were the first time round they're doing my head In this time asking me how they are when my next appointments etc are, have we sorted names yet, have we got care for 1st child when we go to the hospital (we live 3 hours ish away from parents etc and I think they all feeling a little put out that we haven't asked them to help with that, and for the suffocating reasons up until now it's actually my BIL who will be our go to person to come and care for current son with the understanding he doesn't tell anyone about his childcare role or that I've gone into labour etc)
I am now 35+3 with twins and was given induction date at my 34 week app with consultant... because my family and MIL have done my head in so much throughout I have chosen not to disclose the date I have been given, nor will anyone be informed of my babies arrival until I am happy and confident that myself and two babies are doing well and not requiring any amount of special care. It's not like they can come and visit in the hospital like the first time and although most are doing well with the whole lockdown rules I'm sure they'd find a way to visit even to look through window at home to be 'socially distant' so have also told them no one will be visiting until I say I am ready for visitors and it is safe to do so, no one will be peering through the window to 'visit' because my children are also not zoo animals!.. I'm quite fortunate that my partner isn't exactly close with majority of his family so couldn't care less about telling them anyway so no issues there.
Plus if I am induced or even if I go into labour naturally before that my partner won't be with me from the get go (our trust is letting dads be there from the start so long as not in a bay with other women initially) 1 because he will have to wait until his brother arrives anyway, and 2 he will be bored, what do I need a man sat bored for when I could just listen to my music and if I want support while I'm waiting for him to arrive or for things to move along a little I can call him or I can call/message my friend who knows my induction date but also aware I could go into labour at any time.