I was forced to switch between 25-28 weeks because my midwife practice dropped me as a patient. Long story short, they (or rather, their back up OB...explains a lot!!!) weren't comfortable with my very benign genetic "disorder" (thallasemia, very mild form). Anyway, I spent a few frantic weeks looking for another local midwife that would do a homebirth and was not at all thrilled with what I came up with.
I ended up moving out of state (to where my MIL lives) to have the baby. I've found a wonderful midwife that can do my homebirth and has absolutely no problem with thallasemia. I've had a wonderful pregnancy with no problems at all. The move was the best thing I could've done and do not regret it at all. It was a radical solution, but I'm very surprised at the support we've received from everyone close to us. I'm virtually stress-free now! Much better situation than if that midwife practice had kept me as a patient!!
It can be done...make the change now and find a practitioner that you are comfortable with and have the birth you want!!! One of my greatest worries was having a regret or birth outcome I didn't want where I was not in control and forever resenting it. Now, I feel completely in control and that I can do it...and do it MY way!