I would keep calling back. Just because you don’t know who your going to get. I agre though it’s not that much more expensive but considering I just found out I’m pregnant and asked the same…It’s DVC so I’m not sure it matters for us, they ussually just let us request the hospitality section.
But sense your there so early if it doens’t work I would see what they could do for you at check in. I’ve gotten someone who gave me a choice of a few open rooms.
On the up note, in all my pregnancy’s I’ve been told walking is the bes excersize for us. Not that walking in the parks wont be enough, just trying to help you feel better.