Hi OP,
You have had loads of good advice already I see. We moved to the States 15 months ago so I’ve recently been in a similar position. I’m also on the west coast and I know LA and Marina Del Rey, in fact we visited there very recently.
The area is lovely, right next to the beach etc. I’m not sure I’d want to live there personally with young children, unless I was super rich, which you may well be.
In terms of healthcare my advice is this. Stay in the UK to have the baby! Healthcare in the USA is an absolute nightmare to understand and organise. I had a very blasé attitutude about it before moving, I had no idea how difficult it would be to get my head around.
Firstly, our healthcare plan did not kick in for 30 days until we were resident. During the time, if we’d had an urgent health needs we would have been covered through travel insurance.
Once you get your insurance paperwork in order, you then have to find doctors surgeries that will accept you as a patient and that work with your insurance provider. This may be straight forward, or not. It totally depends on your plan and local area. You’ll need a general doctor for yourself, a paedtrician for twins and for new baby, an OB/GYN for your delivery and they’ll have to work with a hospital that is in your network etc. Then you’ll have to navigate all the financial side, every time you visit your doc you pay a copay amount, for me it’s around $35, any treatment you need and prescriptions are seperate. The amount is totally dependent on your plan. To have a baby on my plan (and we have really good insurance) would cost around $5k. And if there are any special conditions such as an extended hospital stay etc, the cost goes up.
While it’s inot impossible to navigate all that, I think the stress of doing so at that late point of pregnancy would be high. If you could move earlier or wait, I honestly would consider that.
Just my advice from recent personal experience. Good luck!