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Pregnancy results in a whole lot of changes in a woman's body. You may expect normal pregnancy changes like an expanding uterus and enlarged breasts, but you might not consider other common factors like your heart rate speeding up from around 70 beats per minute to around 90 beats per minute, or the need to urinate much more frequently. One positive side effect of pregnancy is the tendency of your hair to grow lush and full. Unfortunately, like the rest of your body, this returns to normal after the baby is born, too.