one reason for headache is dehydration, so increase your intake of water / liquids. you can drink milk water buttermilk coffee/tea(once a day only) soups juice fresh ones all put together atleast 3-4 liters a day then you will not get recurrent headaches.

Thank you Sonali

Please have your blood pressure checked as that can be a cause for splitting sudden headaches. Dolo can be taken during pregnancy but it's best taken occasionally and not as a regular practice.