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Low blood pressure during pregnancy is caused basically due the tendency of blood pooling in the leg during pregnancy. This makes less blood available to the brain and the rest of the body. Thus, one may feel dizziness and light-headedness during pregnancy. The next cause of low blood pressure during pregnancy is dehydration. Factors contributing to dehydration is lack of fluid intake and exposure to heat. Inappropriate fluid in the body can directly effect the way blood flows in the body.