That's a great question. With my 1st delivery they made me take all of my bobby pins out of my hair
You can, but I used to wear those and they can be pretty uncomfortable and labor is pretty uncomfortable, lol. I would honestly go as comfortable as you can so you can relax and rest. Even if people take pictures, people understand that you're going through labor and you don't need to be a beauty queen, im sure youre beautiful without them.
As long as they are on your head and not down below you're fine to do whatever you want lol