dr. conley says hold up. >> caffeine can be associated with miscarriages.our recommendation is against any consumption over 200 milligrams of caffeine a day. >> those caffeine milligrams add up pretty quickly. eight ounces of starbucks has 165. a small mcdonald's coffee, 100. a can of regular coke, 35. and what about foods? many pregnant women are warned about listeria, oster says don't worry too much about sushi and raw eggs. she ate sushi. she says avoid raw, rare meat, unpasteurized cheese and deli or turkey sandwiches. why risk it? >> listeria is a bacteria that can cause miscarriages, stillbirths and infections in infants. >> should pregnant women worry about gaining weight? oster says you should probably be more concerned about gaining too little weight than too much. conry disagrees. >> obesity is associated with birth defects, diabetes, increased c-sections, a number of different things. >> when it comes to pregnancy, maybe the biggest taboo is alcohol, but oster says relax, "there is virtually no evidence that drinking a glass a wine a day has nega