Anti-D injection is given to pregnant women who have Rh-negative blood type to prevent complications if the baby has Rh-positive blood. It helps stop the mother's immune system from forming antibodies that could affect the current or future pregnancies. Doctors usually give this injection during pregnancy and sometimes after delivery if needed.

Even if your Coombs test is negative, your doctor may recommend the Anti-D injection during pregnancy to prevent complications in case of blood mixing. This helps prevent your body from producing antibodies that could affect your current or future pregnancies, especially if your baby is Rh-positive. It is generally safe and helps protect future pregnancies, so it's best to follow your gynaecologist's advice rather than waiting until after delivery.