From what I understand (and I could be wrong) its not about being o negative or a negative or whatever, its about lacking the rH
factor making you rH
negative. If they had found that your blood
negative, they would have tested dad's blood too. If he is also negative. No issues. Negative is a recessive trait so if dad was positive, baby would be positive and the difference in you and baby is what would cause issues. Hope this helps a little.