Oh bless her...! If you have a GA you will have your polish removed from a couple of nails - just to check your oxygenation - the O2 monitor cannot read your O2 levels through polish either.

As for having no polish for your pregnancy - go for it gorgeous. It takes 5 minutes to take off your polish. It would kinda be like saying you should never wear polish in case you ever need a GA. Just not necessary - but a cute thought!