Anyone thrown up due to prenatals?

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I’m not pregnant yet (I don’t think I am, at least). But I’ve been taking prenatals for 2 weeks to prepare to ttc. Two nights ago I threw up and I’m not sure why. I’m thinking it’s because I didn’t eat as much as I usually do during the day and took the pill on an emptier stomach than usual? Last night I was slightly nauseous too, though. And that was prior to taking my prenatal. Thoughts?