http://www.totaldiscountvitamins.com/Merchant/stpframe.htm
Yes. This Standard Process Tuna Omega-3 Oil is wonderful during pregancy. I haven't taken it with my first, for I only researched it after I had my son, but I will definately take it when I get pregnant again.
As for prenatal vitimins, I can't remember what I took, it was a pink and blue capsule (prescription) and they didn't make me too sick (the Dr. should know which one this is). Taking the right amount of folic acid is VERY important.
Red rasberry leaf is great too, and marshmallow root is supposed to really boost your milk supply.
Just be careful b/c a lot of supplements can be very harmful/fatal to the baby, esp. rosemary, black licorish...
As for regular multivitamins, my Dr. told me that the Woman's One A Day, and Flinestones are two of the best!