Preggers in Disney World

I'm 20 weeks and in Disney on vacation. Most of the "fun" rides say expectant mothers should not ride. I agree with some like, Rockin' Rollercoaster and Space Mountain but others like Disney's Speedway (slow speed go carts) I don't agree with the warning. I'm specifically asking if anyone has ridden Test Track in EPCOT while pregnant and what their experience was. Thanks!