LOW blood pressure

Is anyone else having trouble with their blood pressure being low. With my first pregnancy it was low during the first trimester and high in the last. This time around it has stayed low. My doctor isn’t concerned so I’m not really that concerned either but I’m sooooooo tired all the time. It has been staying around 91/61 or 105/57 so just above clinically low blood pressure or one number is below. Any tips on how to get it up or get some energy?