RH -ve Pregnancy

Hi! Can you throw some light on the following question? A lot of information on RH –ve pregnancy is available on net. The conditions discussed are mother having RH –ve group and the baby having RH +ve group inherited from father. However, if the mother has B +ve group, the father has B –ve and the baby also inherits RH –ve, then the condition of RH –ve pregnancy arises or not? Wish you all a very happy days ahead. Mahess