My personal belief for why I've been feeling so well (as side from the fact that I'm rarely ill) is that I haven't changed much about my diet and exercise regime. I haven't had to say this to anyone, but if anyone asks me if I think I should stop biking, or running, or doing aerials while I'm pregnant, my prepared response is: "I'm only pregnant, not ill or disabled."
So yes, I'm still running twice a week (albeit rather slowly), I'm still biking to work everyday (I've got bike lanes almost all the way), I'm still doing body weights at home with Andrew, and I'm still going to aerials. When I told the folks at Esh (where we take classes) I was immediately told to keep training for as long as I wanted--and so far it's been fine. I did have to stop going to the advanced silks class because we were doing a lot of drops, many of which required ties around my waist, but it means I get to work on an apparatus I haven't used in 2 years, the trapeze. Not that I exactly love trapeze (it hurt so much more than silks, I swear!) but it keeps me going--and I can still train basic stuff on the silks on the weekend.
I think that's about all I've got to say about being pregnant right now. I'm seeing a midwife at MIT, and so far things are good there. We still need to replace our beloved Smart car (I will write a moratorium when we finally buy a new car), which is being held up while we wait to hear about other decisions that aren't exactly in our hands. Then we can make a few more of the major baby purchases like car seat, stroller, etc.