What are the current regulations on pregnant Marines (or soldiers, sailors, or airmen)?

It's depending on the pregnancy stage, health status of baby and mother. There is set hrs for cases that are not high risk etc but it's all depending on individual situations and best judgement of the medical staff.

Sgt Melinda Enfinger It's been a while since your question, so I'm not sure if you've found the answer you wanted, but yes, there are regs on PT and pregnancy for Marines. In fact a recent MARADMIN just extended the recovery time following delivery before the first required PFT.

As above depends on stage of pregancy and if high risk. A DR will set all that during visits. Most units/post also have a program setup for pregnant soldiers to do PT while they are and after they havethe baby.