Greetings from the Dive Capitol of the World.  I would suggest contacting PADI  or NITROX or a certified diving instructor.  
Plenty of mommies dive around here, although I can't advise on deep dives.  I am counseling for a couple that the father is a dive instructor and I will ask his input as well.
Down here we all snorkel and boat while pg and I have done both while nursing as well.

http://www.padi.com/english.asp   PADI

http://www.iantd.com/   NITROX

Mirine Dye, CCE, CD
Childbirth and Lactation Educator in the Fab Fla Keys
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