First off, congrats!
As far as Universal goes,, you should be ok on anything there, cept for the new Return of the Mummy, which I have not been on yet, but is sounding like an indoor rollercoaster.
When it comes to Islands of Adventure tho,, you may find there are alot of rides that don't advise pregnant women ride. I think it depends really on how far along you are. I would think definately you should avoid:
The Hulk
Dueling Dragons,
Dr Doom's Fearfall
but the others are a bit in the grey area,, Jurassic Park is a calm ride, until the drop, which is a bit longer and steeper than Spash Mountain
Spiderman is a bit jerky at times, but is the best ride there.
Dudley DoRight's Ripsaw is a log ride type thing, but the end drops can be a bit intense.
Popeye is a river ride thru rapids, and can be a little jerky,, but is great fun and wet on hot days.
It could be that you may end up able to do more at Universal than at IOA.
have a great trip
