I will be three months pregnant on our upcoming trip. I know there are rides I won't be able to do - BTMRR, SM, TT, EE, etc., but I am still looking forward to it.
I enjoy the slower rides a lot anyway, the Fantasyland rides, Soarin, HM, Country Bear Jamboree, the Safari, plus all the shows, the movies in the different countries in Epcot, the 3D movies in the parks, and everything else. I booked an Illuminations cruise, have ADR's for everyday, and always look forward to my favorite Spectromagic Parade.
I plan to spend the afternoons at the resort pool relaxing.
I think there's plenty to do and enjoy, even skipping the rougher rides.