Re: Finding OB in 3rd trimester...?
I don't know anything about homebirths because it wasn't something DH was willing to consider. Is your midwife able to deliver at a hospital at all? I switched Dr.'s at 26 weeks and it hasn't been terrible so far. I'm currently at 33 weeks and have been to the new office 2 times if that makes a difference. I do believe that you can just show up at the hospital and get an on call Dr. when the time comes, but I don't think I would like that route.
This is just my experience so far and if you think you can go through the homebirth go for it.