how do i know if i have rh negative blood
As part of your prenatal care, you will have blood tests to find out your blood type. If your blood lacks the Rh antigen, it is called Rh-negative. If it has the antigen, it is called Rh-positive. When the mother is Rh-negative and the father is Rh-positive, the fetus can inherit the Rh factor from the father.This makes the fetus Rh-positive too.ensitization can occur any time the fetusâs blood mixes with the motherâs blood. It can occur if an Rh-negative woman has had: 1  A miscarriage. 2  An induced abortion or menstrual extraction. 3  An ectopic pregnancy.