Well, how often are you calling her? If you're calling her every few days or so, she probably will start to get annoyed. I'm not saying she's right in doing so, but she IS human. Then again, if you ever have questions that's exactly what you need to do - call your doctor. If she gets annoyed, that's her problem.
But I don't think you should find a new doctor. You're right at the homestretch, and you don't want some strange person who doesn't know you or your history delivering your baby. Let this doctor deliver you, and then if you want, don't use them again in the future. Also, if what s/he said is really bothering you, next time you see them, let them know that you heard what they said and that it really bothered you. Maybe they were just having a bad day and it slipped out, or maybe they didn't think it would hurt your feelings.
Good luck.