Congratulations.
I agree with Roger and Dave, unless the chem lab has changed drastically in the last ten years, there are many things in there which give me cause to be concerned. Even if you are not still using the same nasty reagents that I used to use, I'll bet that your lab is like every other lab -- there are "artifacts" of bygone methods and equipment in the cabinets and drawers. Please don't go near the cabinet under the sink. Don't open any unlabeled containers. Don't touch the lead bricks.
While nothing in your workplace contains anything in large enough quantities to put your health in immediate danger, even trace amounts of some elements pose a threat to fetal development.
Now that I have worried you, I apologize for the alarm. The fact is that most of those elements are present in any workplace and not as well controlled as they will be in yours. Your lab is miles ahead of the ones in the dirt burners. You and your unborn child are plenty safe as long as the housekeeping is maintained and you remember to wear your PPE. And of course, WASH YOUR HANDS.
The fact is that you and your coworkers are very well trained in dealing with workplace hazards. Part of that includes a heightened awareness of what those hazards are. The other part of that is that you control them better than most of the rest of the world's workforce. So, you are probably safer at work than you would be in many other places. I would not recommend, for example, that you take your car to have the oil changed and wait for it in the room next to that nasty garage. Have someone else pump your gas for you. Don't clean your oven with that stuff in a can. Don't be around anyone who is smoking. Don't handle raw poultry without gloves, and disinfect your countertop afterward. Yadda, yadda, yadda.
The most important thing to remember is that you do what you feel is safe and avoid things that you feel are unsafe. Follow your doctor's advice about flu shots, and avoid people who appear to be sick.
Again, Congratulations and best wishes to you.