We have a variety of Birth and Breastfeeding book in our lending library. 

Do you have a "Birth Ball"?
These are just the normal exercise ball used during pregnancy, labor, and soothing a newborn. 
We recommend you buy one!  We also have them for our clients to borrow, if you prefer.
The balls we loan are 65 cm.

Great birth ball ideas and information. 
It's a good idea to have a spotter (partner or friend) stand behind you ready to assist should you lose your balance. 
Since pregnancy shifts the center of gravity, it may take a while before you feel stable.