We went in 2006 when I was 3 months pregnant with DD. At that time I was working 12 hr shifts on my feet all day at work, it was also a physical job with a lot of walking and lifting. I also have horses and rode 4 days a week or so. The horses are kept at home, so I was mucking stalls and doing everything else involved with their upkeep.
When we booked the trip our
travel agent warned me against going and that it may be too much for me. (We were going for 10 days). Several co-workers also cautioned me. My thoughts were if it was ok with my doctor and I was still expected to work 12 hr days etc, and I felt fine I would go with the mind set I would do what I could do and be happy. After all I love the shows and music and the food!
At MK I rode everything except Splash. I did Space Mountain once. I found I got dizzy much more easily while pregnant and that one bothered me (only because I felt dizzy). I would probably skip it now though because it seems rougher than it used to.
At Epcot I rode everything except TT and MS.
At HS I rode everything except ToT, RnC and Star Tours. I think the new Star Tours is less rougher than the older version. So I'd have to think about this one, but I'd probably still give it a miss.
At AK I rode everything except Dinosaur, EE and Kali. I had never been on Kali before but if I had to do it over again I would go on it.
I'm not sure if any of this info will help you. There is a big difference from being 3 months pregnant with a first baby and 6 months pregnant with a 6th baby! You both have been before so know what the rides are like and your wife will know what she is feeling up to. Sometimes I just chilled on a bench for a little while if I was feeling tired. Hey, any excuse to have a Mickey ice cream....I think the baby wanted one

.
Our DD (who is 7 now) is a WDW lover. She is always up for trying new rides. She gets to try new ones every year as she gets taller-45 inches and counting.