OK so I'm really concerned. My doctor told me that I am 0- there for they told me I need to get the Rh shot but they really didn't explain to me what all this is about ? So I'm worried its something bad they told me since I'm Rh- my baby's father can be Rh+ and inheritate to our fetus but how do they know if he's Rh- Or Rh+ I want to know if he's negative or positive so that if were both Negative I won't have to get the shot juss for nothing.I really need help with this :( & Im 25 weeks pregnant !