I would recommend caution in dealing with the issue of "pregnant women", as this became a huge issue with Johnson Controls, Inc. back in the early 1990's in their automotive battery plans (I was HR/Safety in one.) The case was based on discrimination against women as they were removed from "leaded" areas and/or denied opportunities in those areas. While this never officially went through OSHA, the bigger issue you will have is ensuring you meet all the OSHA standards concerning the Lead Standard as for proper PPE, sanitation, clothing, footwear, etc., plus a proper medical surveillance program. Of course the best practices you can have to maintain the lowest exposure to lead is preferred.