Changing Doctors at 27 weeks

I'll be moving to a new state due to my husbands job next month. At the time I leave I will be starting my 27th week and just wondering how to tell my doctor. I love her but even if I wanted to stay for the birth the new place gives me a spectacular NICU within 20 mins whereas here it is 3 hrs away. The possibility of a c section would be less scary if I had my husband. Any advice on trying to find a new OB? I have had a baby there and plan to call the office of the same doctor and see if they can see me. I have tricare though and will be required to get a referral before visiting my new OB. Terrified but this is the best option for us.