If you are worried about it I would speak to your manager or principal dentist. If it's practical to avoid something whilst pregnant for piece of mind there shouldn't be a problem.
I had a look on the website of one of the major automatic developer manufacturers, they provide safety data sheets for their chemicals.
I have added links.
velopex.com/wp-content/uploads/2015/06/1...afety-Data-Sheet.pdf
velopex.com/wp-content/uploads/2015/06/1...afety-Data-Sheet.pdf
I'm assuming the chemical composition is more or less the same no matter what method you use.
Worth a read, and info to show your manager. Section 16 on each sheet might be of use
Good luck