Change in shoe size?

One of my biggest fears about pregnancy is my shoe size changing. Sounds silly, I know, but I'm a shoe girl and have had some for years! There are a few that if I couldn't wear anymore, I actually think I'd cry!

How likely is my shoe size to change in pregnancy? Currently 17 weeks. I work from home and sit most of the day and usually wear slippers, unless I have an in-person meeting or have to run an errands. Anything to do to prevent a change in shoe size?