15 Surprising Ways Pregnancy Transforms Your Body --- and Your Mind

4. Your Heart Works Overtime

During pregnancy, your heart basically gets promoted to "Super Pump." It works harder to send extra oxygen and nutrients to your baby, causing your blood volume to increase by up to 50%! But here's the catch --- your red blood cells don't increase at the same rate, making your blood a bit more diluted. That's why many pregnant women feel a little dizzy or out of breath. It's your body doing double duty!