What if you have a RH- bloodtype?
Usually individuals with RH-bloodtype who have a (surgical) abortion or miscarriage after 12 weeks or delivery are advised to have an injection with anti-D globuline. If the fetus has a positive blood-type and it is exchanged with the mother, they can produce antibodies that can potentially affect another fetus if they decide to have another baby.
However, research indicates that early medical abortion and first trimester (first 12 weeks) spontaneous abortions have no or very little exchange in blood between the pregnant person and the fetus, and that the pregnant individual does not make a significant amount of antibodies that could affect the next fetus.
We do not advise you to get an injection with anti-d globuline for a first trimester (12 weeks) medical abortion. But if you feel unsure, you should seek professional medical care shortly after having the medical abortion, say that you had a miscarriage and you are rhesus. Depending on your doctor, they might decide to give you anti-d globuline.
There is minimal evidence that administering Rh immune globulin for first trimester vaginal bleeding prevents maternal sensitization or development of hemolytic disease of the newborn. The practice of administering Rh immune globulin to Rh-negative women with a first trimester spontaneous abortion is based on fetomaternal hemorrhage in late pregnancy. Its use for first trimester bleeding is not evidence-based.