iron tablet

Hi mummy,,sy 18 weeks prgnant,hb sy drop dr 12 jd 11,so nurse kk soh sy mkan iron tablet,vit b complex n acid folid,.lepas mkn kepala jadi pening,,jalan pn rasa pusing kepala ,,so nk jln kne pegang mak sy nk elak kan sy trjatuh ..mmg mcm ni ke effect nya?sbb before ni mkn obimin x mcm ni?