I went once when I was 16w pregnant...basically avoid all the "mountains" (I avoided splash mtn as well) and dinosaur at Ak. (We had an enthusiastic driver on the safari at ak...so that may be a little iffy) Teacups might be another to avoid.
I basically just ate all week. It was awesome. Lol
We also went to universal that week which is absolutely pointless if you are pregnant IMO
Best of luck trying!