S.D.
My conversations with doctor friends and my own OB I learned that as long as you are healthy, in general, you can eat what you like. There are a few taboos if you are healthy - alcohol and sushi being two, and honestly, (don't flame me), if your sushi is from a reputable place and your alcohol just a sip here or there, you are probably fine. Actually, I read some midwifery books that suggested you should have a hot bath and a glass of wine when you go into labor to calm you down. :)
Realistically, I just ate what the babies asked for as I quickly learned some of the things I wanted - like fruit! - made me ill. Oh, soft cheeses and raw eggs are on the taboo list, as is cleaning the kitty litter as all of the above can make you and the baby ill. In the case of soft cheese, I've been told that as long as they are pasteurized you are fine. Common sense, EATing the kitty litter is way bad :)
You should be trying to keep down a prenatal vitamin to keep your iron levels up, and if you can't, flintstones are good enough.
Congratulations! Hope your pregnancy goes smoothly.