Congrats on your new baby-to-be! I went to WDW in 93 , 5 mos pregnant w/ my 3rd. I have to be honest, I rode almost EVERYTHING! I talked to my OB/GYN before leaving and he gave me the green light to use my discretion. Now, let me state here that I was VERY active w/ this pregnancy and I was used to LOTS of walking to begin w/, this was a healthy pregnancy and went on to have a healthy little (well 8lbs 10z) girl. I think that only you know what you can handle. I didn't find any of the rides at WDW too rough for me, including Space Mt. Now, the spinning rides, I wouldn't and still won't do...they make me sick to my stomach. I have to say, if you are in doubt, don't do it. Just my 2 cents. Have a great trip!!!
wendy