I have been twice while pregnant. Once in December in 2002, and I had just found out like a week prior to our trip, and once in June 2005, when I was 7 months pregnant. I went on alot of rides, the only ones I ever skipped out on where the ones with the restrictions, ex. Indy, Splash, SM, Star Tours, Matterhorn, BTMRR, and Roger Rabbit. The only other ride I did not ride that does not have the restriction (at least then it didnt) was Autopia, because of the bumpyness of it and the risk of getting rear-ended by the guests behind you. I dont think I rode anything in DCA, except some rides in Bugs Land.
HTH!! And have fun!!!
P.S. From your siggy, I am assuming you guys are ready for a boy!!!