I washed all mine b/c someone told me they needed to be washed before coming into contact with a newborns skin.

I would generally wash anything I bought from the shops before using it anyway. ie/ sheets, towels, clothing etc.

Perhaps if you just wash the things you think you will be taking to the hospital and leave the rest until you get home so if you want to change something you have the option to do so. I have exchanged things with the tag off, but as long as you have the receipt I wouldn't stress too much.

All the best.