You don't just invite someone to your labour. Even a photographer has to feel 'safe', so you can focus on giving birth. That why it's important to meet beforehand, if necessary a couple of times, to find out if we have a click. 

As a birth photographer I am invisible and unnoticeable during labour;  I will make sure you will hardly know I am around. I will take beautiful pictures of you as a birthing team, the love, the emotions, and of course your wonderful baby once he or she is born. I will listen to your wishes and will take pictures where and how you want them to be taken.

Note to that I will take your caregivers' privacy into account and it goes without saying that your pictures will be treated absolutely confidential.