Frustrated with doctor!

Ally
So I'm 36 weeks 1 day today and I had a doctors appointment this morning. At my appointment 2 weeks ago (34 weeks), my doctor said next appointment (35 weeks) would be GBS test and blood draw to test my anemia and low platelets, and 36 week appointment would be an ultrasound. Well I showed up to my appointment last week, I had to schedule it 1 day before 35 weeks because of school, and he said it was too early for the GBS so he said next time (and told me 10 days, not 1 week like he said before), and then ultrasound at the next one. So I went in this week and he did the GBS and blood draw, that's it. Didn't check cervix or dilation at all, which I've been wondering about so I was kind of upset, and didn't want to see me for 12 days. So I asked if that appointment would be the ultrasound (finally, I've been waiting and looking forward to an ultrasound for so long!) and he said no because it's not enough time to get pre authorized from my insurance. So he said probably the next appointment after that (!!!) so I said won't that be too late?, and he goes "no because its your first baby". I am just SO IRRITATED. First I'm upset that I'm still not being seen weekly, 36 weeks and now I won't be seen until 38 weeks, and then he won't do an ultrasound until 39 weeks? That's seems really strange, how do they know baby is still growing/fluid levels are okay, etc, if they haven't done an ultrasound in almost 20 weeks?! Second I'm upset that he didn't check cervix or dilation, I am FTM and very curious how I'm progressing, especially since I can't see by ultrasound! Third I'm annoyed that he seems to think since it's my first that I will go over my due date or something and he doesn't have to worry about me right now. I just feel like I'm not being taken seriously by him and I wish it wasn't so late in the pregnancy or I would find a new doctor. My mom had a choriangioma on the placenta with one of her pregnancies and the baby stopped growing at 30 weeks. It was caught at her 3rd trimester growth scan at 34 weeks and she had to have an emergency delivery that probably saved my sisters life. This is why it concerns me that I haven't had a growth scan by my doctor since 18 weeks! There are very real things that could be caught at that time and I just get worried. I know people will say to feel lucky or whatever that my pregnancy had been uncomplicated that my doctor doesn't seem to think I need these things, but to me it just feels like he's being careless and I would just like the reassurance. Sorry for the extra long post, needed to vent because I've been upset about it all morning.