From the photos I've seen you post on here, I would be honoured for you to have taken photos during my birthing experience. They are lovely and you definitely have unique and very beautiful style.
I'd say keep going with what you're doing, there would definitely be a market out there for it. I remember when I was staying on the maternity ward a lady came around and offered to take portraits for us. She showed me some examples and they were so tacky and cliche that I said no. But if I would have seen a portfolio like yours I would have jumped at the chance.
Truly beautiful work, and you can really feel the passion you have for birth and what an amazing experience it is. Good luck