Should I take a prenatal vitamin even when we're not actively TTC?

Me and my husdand both want a family, we have put monay away for a baby and both have promising careers (Him militarily; Me a child care worker w/10 years experience) he is finnishing his degree in December and I am in May. Untill then we aren't actively TTC but both agree that if we do conceive it will be a blessing! Should I take prenatal or wait untill we are actively TTC?

(Note: I'm not on BC and take medication for insomnia)

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