Atleast you were told you were getting the shot! lol I was told early on that i'm RH negatiive and i'd have to get a shot if OH is positive. but it never came up again until i went in to take my glucose test at 28 weeks.Lol they surprised me and told me THAT DAY i was getting the shot during my glucose test. was a big surprise to me hahaha.
I actually have the info pamphlet with me right now i'll type some of the highlights:
Hemolytic disease can be prevented
RH immunoglobulin (RhIg) is a blood product that can prevent sensitization of an RH neg. mother. it keeps her body from being able to respond to RH pos. cells.
RhIg is safe and easily obtained. RhIg is NOT helpful if the mother is already sensitized.
RhIg is safe for a preg. woman to use. The only known Side effects are a soreness where the drug was injected or a slight fever. BOTH side ffects will go away.
(I develeoped the slight fever, i slept through it though! only a few hours, i woke up all sweaty =( )
Doctor may suggest that the pregnant woman recieve RhIg around the 28th week to prevent sensitization for the REST of pregnancy.
After birth if the baby has Rh pos. blood the mother should be given another dose of RhIg. In almost all cases this treatment prevents the woman from making antibodies to the Rh pos. cells she may have recieved from her fetus before and during delivery. NO treatment is needed if the father of baby or baby iis also Rh Neg.
The treatment is good ONLY for the pregnancy in which it is given.
These antibodies that the pregnant woman's body makes go back to the fetus and attack the fetal blood. They break down the red blood cells and produce anemia, this condition is called Hemolytic disease. It can become severe enough to cause serious llness, brain damage or even death in the fetus or newborn.
Once formed these antibodies do NOT go away.
In a first pregnancy, a small number of these pregnancies start having problems during the last 3 months
In a second pregnancy with an Rh pos. fetus the antibodies are more likely to cause Hemolytic disease in the fetus. in most cases, the condition becomes worse in later pregnancies
NOW
What happens if Antibodies develop???
Once a woman develops antibodies RhIg treatment does not help.
Doctors are finding ways to save infants who get hemolytic disease. A mother who is Rh sensitized will be checked during her pregnancy to see if the fetus is developing the disease.
In Some cases of Hemolytic disease the doctor may suggest delivery at the normal time. Delivery may be followed by a type of transfusion for the baby that will replace the diseased blood cells with healthy blood. For more severe cases the baby may be delivered early or given transfusions while still in the mothers uterus.
PHEW! lol After reading all that I thought it was in my and my babys best interest to recieve the shot.

I hope this helps some of you ladies!