First appointment. Anything to be prepared for?

My first ever OB appointment is tomorrow! I'm already super nervous and afraid. I have severe anxiety and it definitely keeps impacting the pregnancy. I keep worrying myself sick that the baby stopped growing or something will be seriously wrong. Is there a way I can address this with my OB without sounding like a paranoid psycho? Because that's what I feel like. Also, what should I expect tomorrow? I'm 9 weeks and 1 day. My fiancee AND my mother are going. Will they both be allowed in the room? If not, who do I pick to stay? Is there anything I should kick them both out of the room for?