We moved from the Midwest (MN!) to Seattle three years ago so that my husband could attend medical school here. We packed up our three kids (ages 1, 5, and 7 at the time) and left all that we knew and everyone that was near and dear to us - all of our family and our closest friends. Like you, all of our family was always a short drive away. Now, it is a two day drive or an airplane trip.
When we first moved, I felt homesick and it was difficult to be living somewhere in which I had no friends and family (and really didnt know anyone either!). Making close friends took time and it was hard going through that "getting to know you" phase of friendship making because I so desperately just wanted to be around those who already knew me well. Though it was a difficult adjustment, there was beauty in the process as well. Like you said, it is an adventure to be somewhere new - and there is something special about being in a new place, far from home, where you journey with your partner in a way you haven't before.
Here in WA, I have made some of the closest friends I have ever had in my life. Since we are so far from our family and dear friends from home, our community of friends here have truly become family to us. They have helped us with our kids, supported us during challenges, and have just been there in a way that I am so thankful for. When we came here, I knew I needed to find "sister mamas" and connect with families to create a community of support and love. In time, that did happen.
I love to sew and craft and eventually stumbled upon a group of crafty mamas who got together about once a month to craft, chat, and laugh. Several of those mamas (and their families!) have become dear friends of ours. I also met other friends through my kids - they attend a wilderness school once a week and we met many wonderful families through that!
I would encourage you to explore your interests and see if there is perhaps a group or class related to something you are interested in that might lead you to get to know others. It would be great if you could find a way to meet other expecting mamas... maybe somwthing like prenatal yoga or childbirth classes...where perhaps you will find someone that becomes a dear friend down the road! We also met some wonderful families through getting to know my husband's colleagues. The hardest part is it just felt like it took so long to "find our people", but when we did, I was really able to settle into our life here. Actually, we don't know if we'll ever move back to MN now
...and that thought would have never crossed my mind when we moved here!!
When I read your post, my heart went out to you. Sending love and wishing you the best as you find your way on this new adventure before you!