What if you have a RH - bloodtype?
Usually doctors advice women who have an (surgical) abortion or miscariage or delivery to take an injection with anti D globuline. The reason is that if the fetus has a positive bloodtype and if there is an exchange in blood the woman can make antibodies in her blood that can affect the next born baby.
However research with early medical abortion and first trimester (first 12 weeks) spontaneous abortions have shown that no or very little exchange in blood between the woman and the fetus takes place and that the a woman does not make any significant amount of antibodies that could affect the next fetus 62 . We do not advice you to get an injection with anti-d globuline. When the duration of your pregnancy is more than 12 weeks, you should to a doctor or hospital shortly after having the medical abortion, say you had a miscarriage and that you are rhesus -, the doctor might decide or not that he thinks he should give anti-d globuline anyway depending on his opinion.
More scientific information:
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 expert opinion and extrapolation from experience with fetomaternal hemorrhage in late pregnancy. Its use for first trimester bleeding is not evidence-based 62 .