Well, for starters they probably sway blue, but I don't think that's what you are asking me.
We are all part of the "Great Vitamin Experiment". We evolved in a world where we got nutrition from the foods we ate, it is what our bodies are designed to do, we have a healthier diet than at any time in human history, and it has really not been studied as to whether we are even benefitting from those nutrients or if they may be harmful. This is especially true of megadoses of things and when we are pregnant, it's not just our own bodies but our baby's bodies that are getting loaded up with nutrients that they may not need. Only folic acid (or folate, which is better) has ever been proven to prevent birth defects taken before pregnancy (let alone during) and even during pregnancy they are not shown to help Do women really need all those prenatal vitamins? - CBS News (with exception of folic, iron, Vit. D and Iodine and the last 3 are only for those who are truly deficient in them)
I am not a fan of Pregnacare. It has absolutely massive doses of many of the B Vitamins. These have delayed and even stopped ovulation for people and made LP get really short. Considering that at the same time prenatals came into wide usage, autism and food allergies have both exploded exponentially it makes me very nervous to see you guys taking massive dose prenatals.
I'd suggest good ol' trusty orange Women's One a Day, I take it daily, did for my last 3 pregnancies and I really, really believe in it! It's just a good formula and it's affordable too.
If you like to compromise between vitamins and swaying, I'd take them 3x a week instead of daily. That way you're still giving your body a little boost without having them every day. I use this for lots of people who have been swaying as long as you have, Squiggle. :)