Re: Pre-natal vitamins
What do you mean by would they work? What they are is a collection of vitamins and minerals specially formulated to fulfill the pregnant body's needs. They're more expensive than normal multivitamins, which are enough to support you when you're not pregnant or nursing, but they should certainly have enough of everything you need then too.
Two things to check for, though, before continuing to use prenatals when not pregnant, nursing, or ttc, are Vitamin A content and Iron content. Both of these are things you need more of when getting ready for or sustaining a baby, but things which in excess can be dangerous. Make sure your vitamin doesn't have substantially more than the RDV of either one and you'll be fine.