This is a very complicated thing to explain and in fear that I might leave something out or not thoroughly explain it I researched it for you...This is a very useful website. Hope this helps!
http://www.webmd.com/content/article/4/1680_51841
Blood Rh becomes a problem in pregnancy when an Rh-negative mother is carrying an Rh-positive baby, inherited from the father. If fetal blood cells enter the mother's bloodstream, her immune system may produce antibodies against the Rh-positive blood, leading to hemolytic disease of the newborn (HDN) in subsequent pregnancies. This condition can cause serious complications for the baby, including anemia and jaundice. To prevent this, Rh-negative mothers typically receive an injection of Rh immunoglobulin (RhoGAM) during and after pregnancy.
When having RH blood type, it can complicate pregnancy, but it is rare. It is normally when the fetus's blood travels through your canal. RH blood types are compatible with other RH blood types.
If an Rh negative woman is pregnant with an Rh positive fetus, her body will produce antibodies against the fetus's blood, causing a disease known as Rh disease
Pregnancy complications related to blood types include Rh incompatibility, where the mother is Rh-negative and the baby is Rh-positive, leading to potential issues like hemolytic disease of the newborn. ABO incompatibility can also cause problems, such as jaundice in the baby. These complications can be managed with proper medical care during pregnancy.
If the mother is Rh negative and the father Rh positive there is a possibility that the unborn baby will be Rh positive as well. If the baby is Rh positive than the mother (who is Rh negative) has antibodies made for Rh positive substances which would include the baby. Basically the mothers body will attack the baby because it is not a match with her body. Commonly this is not as much of a problem with the first baby because the body does not build up the resistance to the first child but the second child will often run into complications because the body has built up antibodies against the second child's Rh positive blood. This is often called Rhesus disease or Rh disease.
HDN or hemolytic disease of Newborn (erythroblastosis fetalis) may occur oafter the first pregnancy if the female is Rh negative and the male is Rh positive. The fetal blood will be Rh possitive. in the first pregnancy, the mother will be exposed to the fetal blood. and will make antibodies against the Rh+ blood. but the maternal attack on the fetus will only happen after the first pregnancy. Rhogam may be administered to prevent this
Problems with the Rh factor can arise during pregnancy when an Rh-negative mother is carrying an Rh-positive baby. If the mother's immune system produces antibodies against the Rh factor of the baby, it can lead to hemolytic disease of the newborn in subsequent pregnancies, causing complications for the baby.
Only RH- women run the risk during pregnancy of their babies developing rhesus disease, so yes RH+ women can marry anyone without a risk. Their are also tests and treatments for RH- women who are carrying RH+ infants.
Having a negative rh blood type can seriously affect pregnancy and should be monitored closely. The possible incompatibility between the mother and the fetus could result in the mothers antibodies attacking the fetus as if it were a virus. This can be prevented by a shot roughly 28 weeks into the pregnancy.
A person who is Rh negative may have antibodies if he or she has been exposed in the past to Rh positive blood. Rhogam will prevent this sensitization in a pregnant woman with negative blood carrying an Rh positive baby.
when a Rh+ mother carries a Rh- baby for second time, there is a high risk for the baby to suffer from a fatal disease called erythroblastosis fetalis , so it is necessary for one to know her Rh factor as well as her baby.
if your rh- your anti-bodys can attack the fetus but not usually with your 1st pregnancy