Sayang, pening kepala dalam first trimester memang common lah sebab hormones berubah dan blood pressure boleh drop, tapi kalo sampai tak boleh tidur, better get checked dengan doctor tau, just to be safe! A few of my mum friends also had this and doc just advised them to drink more water, rest more, and avoid standing up too fast. Hopefully it's just that, tapi jangan delay the appointment okay sebab better be sure.