Mild headache during 2nd trimester

Lately I have headache almost everyday when I wake up, not very bad, bearable. I dont feel it much when I work or do an activity. But when I try to sit and relax or lie down I feel the pain is still on. I mentioned this to my gynae and he asked me to take a Panadol if it worsens. Is it normal? Any suggestions on bringing it down? Thanks.