I'm new to this website too. I find I have a lot of doubts, but they're usually alleviated by the certainty of what will happen when I see a doctor. I've only had one prenatal appointment (to "verify" the pregnancy) and what they told me there only reaffirmed my belief that the hospital is not the place for me.
I have severe enough whitecoat hypertension that it will cause my blood pressure to jump up to 40 points when I'm at the office. Then, because with my first I had GDM and pre-e, I was already being treated as high risk. They were telling me all the extra doctors I'd have to see, all of the extra tests I'd have to have, even though I had no indications for this pregnancy and my GDM for the last one was completely diet controlled (I'm now even questioning that diagnosis especially since the hospital then used lower thresholds than the ACOG standard, but that's another thread). I tried to find a midwife but because of my past complications the few I saw wouldn't take me. The birthing center may not have used EFM or other invasive procedures but it still felt too medicalized for me to be comfortable.
In a way, I suppose I was "forced" into a UP/UC with this pregnancy. I felt as though I had failed the medical community's "test" and now would have to do remedial work to prove I can do retake the test and I didn't like that feeling at all. And even though I was "forced" this direction, with our first my husband and I would talk about going to the hospital then he would cut me off and say "But I thought we were just going to have the baby in the bathtub" . So even then we were toying with the idea of a UC, even though at the time it wasn't an option we knew existed. That is what has helped with the doubts and fears most of all is a supportive husband. He understands the birth process and doesn't want to see me in the hospital again (I think seeing the episiotomy was especially traumatic for him - and no, they didn't ask me if I wanted it). He trusts me and because of that I can't help but trust myself.
As far as the U/S goes, I've considered getting one too, but the whitecoat syndrome is bad enough that the thought of having to make an appointment to discuss the U/S is puts me off (With our first, the U/S tech wouldn't tell us anything, saying that she just took the pictures and we had to go over the results with our doctor) Instead I'm practicing figuring out where the baby is by feeling around. I just don't want the stress and anxiety that I felt with the first and I know a large part of that was going to see the doctor.