Thanks for all of your posts below - they really mean a lot to me. I now have an appointment tomorrow at UCSF with the main prenatal genetics doctor, and then I have a level II ultrasound there as well. I was impressed that I got in there so quickly - either my doctor is very important or I am in a bad situation. I am assuming the former. Or, more realistically, he probably told the UCSF people that I am neurotic and high-maintenance and would likely spontaneously combust if I couldn't get some more information. We'll see.
It is difficult to be rational. Like, I know the chances are much better than not that things will be okay. One of my friends took her son to the pediatrician today (a very experienced, in-demand doctor) and she asked about trisomy 20 mosai.cism. He said that in 20 years, he'd never seen it actually happen - ie, people get the bad result on their amnios, then the kids are fine. But it is so hard for me to feel reassured by that, you know? And I know that this would probably come up in plenty of people who never have amnios, and thus never know. But it is still anxiety-inducing.
I was supposed to have lunch and go walking with a pregnant friend of mine today, but she had her baby a couple of days ago (two weeks early). I still went walking (running, even!), which was lovely, but I have since returned to the friend's house where I am staying and have basically been napping, crying, and consulting Dr. Google, who doesn't have as much info as I'd like.
Another thing that concerns me is that I can't feel this kid move yet, I don't think. I know there's a range of when people feel movement, but I know so many people who have felt it way earlier than this. I guess I'll find out more tomorrow.