When I was sick with an ear infection and the start of strep I called my normal doctor and they said since I'm pregnant and sick I need to go to my ob doctor because then if I need any medication the doctor can prescribe it without having to check with another doctor.
You go to your baby doc for baby stuff. Obviously your throat has nothing to do with a baby doc so go to a regular doc. Just be sure to tell them your pregnant
I think you could go with either, but I would go with my obgyn.