If you happened to be a nursing mother I’d encourage you to limit your shooting and to shoot at an outdoor range.
I do change shirts when I shoot indoors, but it’s because I’m usually coming from work in a nice shirt and brass bounces off the walls and leaves soot marks on them.
Hey one other thing just came to mind. Ever burn yourself with a curling iron? Well if you shoot a pistol, as opposed to a revolver, eventually a piece of hot brass will go down your shirt, or get between your glasses and your temple, the thing to remember is that you can’t allow yourself to react to it. It will cause minor damage whereas jumping about and likely swinging your loaded gun around the room while your finger is on the trigger and you’re trying to grab a piece of brass causes real problems. You probably won’t experience this this first time you go shooting, it happens to me less than once every thousand rounds at indoor ranges, but you just never know. Not trying to scare you, you just seem to be the sort of person that prefers to think things through.