Lily Dust I have seen the HG thread, but didn't like to post in there as I'm not actually pg so thought I'd be an intruder sort of Not really needing the support now you know.
You are definitely welcome in that thread, I started it when I wasn't pregnant but going through the same things you are going through now, just trying to get my head around going through it again. So you are in exactly the right place in that thread
I'm not sure about the subsequent pregnancies thing, I had it first and second time so not really very helpful for you sorry.
But I do wonder if in your case it is mentally a bit tougher because you have experienced good pregnancies and bad ones and have something to compare to, where as some people in the HG thread have only experienced the bad so don't really understand just how much different it can be in the same way you understand and have experienced it IYKWIM.