Ate, please see your doctor or go to the clinic as soon as you can, headaches with vomiting at 12 weeks need to be checked out, kahit paano. It's better to be sure na okay lang kayo at baby. Huwag mag-worry na baka abnormal, maraming reasons para dito, pero kailangan talaga ng doctor para malaman. Kami ng iba ko friends, kahit minor-looking symptoms lang we go in right away when pregnant kasi peace of mind talaga. Take care po!