Prenatal Vitamin withdrawals?

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I missed taking my prenatal vitamins for a couple of days & got a major headache. I didn’t understand then but now If I don’t take it within 24hrs I get a terrible headache. My headache goes away 30 mins-1 hr after I take the vitamin. Is it possible I’m having withdrawals? I’ve never heard of such thing. These are the ones I’ve been taking.