I know a lot of people on here will disagree with me on this but I will tell you that I worked around cement throughout my pregnancy. At the hospital where I work we have laminar flow rooms and vacuum mixers that minimize the exposure to the fumes. I also did research on the effects of the cement and the levels that are being discussed here are much higher than what we are exposed to in the operating suite. During my first trimester when the doctor did not use the vacuum mixer I would use a fumevac bowl with suction. I also worked around x-ray during this time as well, always wearing wrap around lead. The point of lead is to protect you, which doesn't change even when you are pregnant. The most important thing to remember is to try to double the lead up in the front where you have the most exposure. I am very comfortable with the decisions I made during my pregnancy. My daughter was born very healthy and 3 days overdue and I worked right up until my due date. I am no way telling you what choice to make. You must do what you are comfortable with because ultimately you must live with your decision. Best of luck to you and have fun making a baby! It will change your life in the best way possible!!