Many pregnant women are comfortable sleeping on their stomach during the first week of their pregnancy, especially if they usually sleep on their stomach. But it can become uncomfortable once your uterus starts expanding and you begin to feel like you are carrying a large beach ball on your stomach.
The traditional cycling tourist usually used toe clips and straps, but touring shoes designed for use with clipless pedals are now also common, usually with a recessed cleat so that the rider can both walk and cycle effectively. Touring shoes typically sacrifice some rigidity for traction and add treads.
Personally, I recommend walking shoes for serious walkers. I've worn both types of shoes, and except when I have sore feet from overtraining, I really prefer walking shoes. More from Prevention: The Best Workout Shoes Of 2012[pagebreak]But if you can't find a walking shoe that fits, by all means, try a running shoe. But go to a store where a knowledgeable salesperson can assist you in selecting a brand and style.