Seems that your blood pressure drops when you suddenly stand up. This is called as postural hypotension. It is common during pregnancy, particularly if associated with anaemia. So get your blood checked and take measures to correct anaemia if found. Eat good amount of proteins through eggs and iron by medicines. I would advice you to get you blood pressure checked up in the following positions: Lying down on the back Lying down on left side Sitting position Standing position All these readings should be taken without loosing much time. They will help the diagnosis. Meanwhile some advice to avoid these symptoms: Whenever you lye down, lye on left side. While getting up, if you are in any other position, turn to left side and get up slowly. After you sit from the lying position, wait for some time before you stand up. And do all these movements slowly. This phenomenon is not threatening. Take care please.