My blood type is rh negative. Am i going to have problems with miscarriages?

I have a 2 year old son and had no problems during pregnancy or labor. But I just miscarried 2 weeks ago and am worried that this might happen again since I am rh negative. I cannot go through loosing another baby! I've heard that the first baby comes easily, but future pregnancies are more problematic. Do miscarriages happen more often for those of us with this cursed blood type?