I don't know my blood type because it has never come up until my miscarriage. I didn't see an ob before because I was early in pregnancy. Had to get a shot for being rh negative but still don't know my blood type. So because I'm rh negative does that mean I have negative blood? My mom is ab negative and also has rh negative blood. Don't know my dads blood type and the doctor says I most likely have the same blood type as my mom.