Hi, Rosario,
I wouldn't worry too much--at least, not enough to let it stop you from TTC if you want to start! Think about how many babies are conceived "by accident," without the benefit of prenatals beforehand, and are perfectly healthy. Also, anything the growing fetus needs, it will take from you... in many cases, the mom-to-be will have the vitamin deficiencies rather than the baby.
Prenatal vitamins, however, are a good multivitamin for any woman of childbearing age, so I'd just start taking them now whatever you decide, that way you will be ready.
Oh, the last point I wanted to make--it could take you three months to conceive, in which case it would be a moot point!
I wish you the best of luck in TTC and have fun, too!
Dawn