We will be going to WDW during mid-Sept for 6 days, at which time I will be about 4 mos pregnant. We are staying off-site in a time share and used a credit with Jetblue for the flights, so the trip is costing us almost nothing. Has anyone been to Disney while pregnant? What was your experience, level of tiredness, etc? We plan to do the parks most days, but not necessarily every day, as I will need to relax by the pool.
I didn't feel tired at that time - just the first few months, and the last month.

I went back to the hotel every day and took a nap and came back for the parades. Give yourself time. Every pregnancy is different and so is everyone's experience. You will do fine!