It will get better, it will take some time. You're adjusting to both the country and becoming a new mom, don't underestimate the culture shock (even if you were from the UK, 15 years is a long time) and all the emotions and hormones that come with being a new mom. The winter will probably hit you hard, too, so keep that in mind if around January it becomes even harder, with the constant rain and short days. But! It does get better, what you're going through, even the grieving, is normal, and you go through different stages along the way. Don't be afraid to talk about how you're feeling and also don't be afraid to seek counseling if it gets overwhelming - you have a lot on your plate and the move, while it brings all sorts of good things, is also something that creates a huge sense of loss and you do have to mourn and go through all that before you get to the point where you accept your new life and settle in happily.
Keep your chin up, we have all been there!