Rh factor (the negative or positive) is a genetic trait. 15% of people have Rh negative blood type (you can be A, B, AB or O, positive or negative). Rh negative factor is a recessive trait. Is your blood type positive or negative? If it's negative then yes, your baby will be Rh negative. If it's positive then your baby will have a positive Rh factor.
This is only a problem if you are Rh negative and have a sensitizing event in your pregnancy (an injury or such that would cause the baby's blood to mix with yours). After a sensitizing event (which can include labor), your body can make antibodies to the baby's blood and cause hemolysis (destruction of the baby's blood cells). Most women have no trouble in their first pregnancies with an Rh positive baby, it's subsequent babies that are at the most risk.
at 11:38 PM on Apr. 7, 2011