I think Common sense is about all you need in this situation. Wear Gloves and a Mask when messing with corals and water changes (Something we all should probably do anyway) No packing heavy buckets once your further along , And Stay off a ladder or stool cleaning glass (applies to larger tanks) .
Its been 26 years ago but when my Wife was Preg with our son (expensive process way back then ) She continues to help maintain the tanks on a Daily bases as i was Working out of town most of the time .
I also believe there really is not enough, Maybe no Data Available for this situation . Doctors will likely over think it and tell you NO Reefing ,nothing to worry about or be cautious . a Marine biologist would likely be best people to ask .But again i feel they will over think. The industry i work in seems to be moving to the Over think about any possible Safety concern to the point its Extremely costly on some Projects.. I have Asbestos ,Lead paint, OSHA Safety and a Number of other Hazardous exposure training Countless expensive number of paid hours Just because a agency says i need it .. 99% Could be summed up to USE COMMON SENSE..
Congratulations .. No Fragging stowaway