With that said you need to work closely with your dentist and possibly you OBGYN during treatment. I think by what you stated above that your family dentist is doing the right thing by not treating you. If he does not feel like he can why force the issue? There are many family dentist that do not do root canal at all let alone on a pregnant women. Going to a specialist just makes scene.

I think you are being to hard on your general dentist. If their office is not set up to do work on a pregnant women, or if your root canal goes beyond what he feels he can do then he is doing the correct thing by referring you off to a specialist. Would you rather he treat you when he feels it goes beyond what he should be doing?

Go to a Endodontics dentist. Let them know how many months you are pregnant the dentist office may wish to speak to your OBGYN to confirm treatment.