Certain Foods

Are there some I should avoid? Yes. Foods that are more likely to be contaminated with bacteria or heavy metals are ones to try to avoid or limit your exposure to. Those you should steer clear of altogether during pregnancy include:
soft, unpasteurized cheeses (often advertised as "fresh") such as feta, goat, Brie, Camembert, blue-veined cheeses, and Mexican queso fresco
unpasteurized milk, juices, and apple cider
raw eggs or foods containing raw eggs, including mousse, tiramisu, raw cookie dough, eggnog, homemade ice cream, and Caesar dressing
raw or undercooked fish (sushi), shellfish, or meats
paté and meat spreads
processed meats such as hot dogs and deli meats (these should be very well cooked before eating)
Also, although fish and shellfish can be an extremely healthy part of your pregnancy diet (they contain beneficial omega-3 fatty acids and are high in protein and low in saturated fat), you should avoid eating:
shark
swordfish
king mackerel
tilefish
tuna steak (limited amounts of canned, preferably light, tuna is OK)
What are the risks to my baby? Although it's important to eat plenty of healthy foods during pregnancy, you also need to avoid food-borne illnesses, such as listeriosis, toxoplasmosis, and salmonella, which can be found in the foods listed in the first set of bullets. These infections can be life-threatening to an unborn baby and may cause birth defects or miscarriage.
And the types of fish mentioned above may contain high levels of mercury, which can cause damage to the developing brain of a fetus.
What can I do about it? Be sure to thoroughly wash all fruits and vegetables, which can carry food-borne illnesses or be coated with pesticide residue. And be mindful of what you're buying at the grocery store or when dining out.
When you choose seafood, eat a variety of fish and shellfish and limit the amount to about 12 ounces per week — that's about two meals. Common fish and shellfish that are low in mercury include: canned light tuna, catfish, pollock, salmon, and shrimp. But because albacore (or white) tuna has more mercury than canned light tuna, it's best to eat no more than 6 ounces (or one meal) of albacore tuna a week.
You may have to forego a few things during pregnancy that you normally enjoy. But just think how delicious they'll taste after waiting 9 months!