I work in a blood bank at a hospital. I can explain this further if needed: Please get the shot. If you don't, your future pregnancies could have complications due to a red blood cell antibody. The antibody that your body could make will pass through the placenta and could attach to the baby's cell and cause severe anemia. Any questions, let me know.I asked my mother and sister about the shot and they said they both had to have it cause they were A negative. My husband is an O positive. My mother and sister said it wasn't a big deal about the shot and they would rather have it then have something happen.