I also have the rh factor. Like loneytearz said it's just a shot......Make sure you get it otherwise it can cause problems for you, and if you conceive again, the baby.
You will get the shot at around 28 weeks(or if you have any complications or bleeding before), as well if your child has the fathers blood type after he/she is born in the hospital.
If i'm correct they give you a choice where they inject it, either near your hip or your stomach.
Good luck!