Doctor cancelled appointment

Karizma
My doctor cancelled my 40 week appointment. Is that okay? Is the 40 week appointment important? I was very upset when they did because they treat me like a number and ive had many cancelled or rescheduled appointments. I really dont want any of them delivering my baby because i feel like no relationship has been built and i dont trust any of them any more than any other doctor. They scheduled me with the nurse practitioner for every appointment until i started demanding to see a doctor. But idk if im overreacting or not. Opinions?