Some pesticides, used in farming, industry, and at home, even flea bombs!
X-Rays at high levels.
Gases used to put you to sleep, if you breathe them in.
Some drugs used to treat cancer.
Mercury, if you breathe in or swallow it. It is used in doctor or dentist offices, or in labs.
Toluene, if you breathe it in. Some glues, gasoline, and some paint thinners have it in them. (If you sniff glue, it can cause health problems for you and your baby. Your baby can be born with birth defects or have other life-long problems.)
Lead, if you swallow it. You may use lead if you make batteries, or work with paints, ceramics and glass. You may also use lead in pottery glazing and printing.