Uy, ang headaches and dizziness na ganyan habang nag-take ng vitamins ay hindi dapat i-ignore, lalo na ngayon na 16 weeks ka na, please see your OB kaagad para ma-check if it's the vitamin or something else na kailangan attention. Hindi ito normal na side effect na okay lang, better safe than sorry sa pregnancy, no? Once na ma-clear ka ng doctor, a few of us moms found na taking vitamins with food or at night instead of morning helped with the dizziness, pero that's only after you've talked to your OB ha. Take care, mama!