Hi Michelle
You don’t say how many weeks pregnant you are but I am guessing you are in the first trimester. One possible and common reason for your dizziness is a low BP. The reason for a low BP in early pregnancy is your veins and arteries are getting bigger to cope with the extra blood your body makes during pregnancy. By week 36 you can have as much as 70% more blood volume. So what is happening to you is that your blood vessels are getting bigger but your body has not made enough blood to fill them all. This can cause you to feel dizzy at any time but can be a major problem when standing up quickly.