You seem to be confused.
Yes, it is recommended to start taking folic acid or prenatals (or as in this case, cleverly marketed 'trying for a baby' vitamins) containing folic acid when - or ideally before - trying to conceive.
No, this is not because folic acid helps you get pregnant.
No, this does not in any way mess up your hormones.
You can, and should, start taking folic acid now. Having enough in your body when you conceive and during the first trimester reduces the risk of neural tube defects in your baby.
This doesn't however mean you need to buy anything marketed as a 'conception pill'. Any over the counter folic acid supplement (400-800 mcg) will do the trick, and no vitamin will make you conceive any faster.
If you opt for a multivitamin, use one marked 'prenatals'. This will not only have the appropriate amount of folic acid, but also the other vitamins in amounts that are safe during pregnancy.