Depends on your and your husband's genotypes. For the Rh factor, since your husband is Rh-, he only has an Rh- allele to pass on to your baby, but you might be homozygous Rh+ (Rh+/Rh+) or you might be heterozygous (Rh+/Rh-). In the former case, your baby is going to be an Rh+ heterozygote (Rh+ from you and Rh- from dad); in the latter case, your baby has a 50% chance of being an Rh+ heterozygote and a 50% chance of being Rh-.
The ABO blood type is somewhat more complicated. Since you've only told us your husband is blood type B, he might have two B alleles (BB) or just one (BO). Similarly, you might have two A alleles (AA), or just one (AO). So, there's a chance you and your husband are crossing AA with BB, which would give a 100% chance of having an AB child. Or, you could be crossing an AO with a BO, giving you a 25% chance of having a child with AB, A, B, or O blood type. If your blood type is AA while your husband's is BO, your baby would have a 50% chance of being blood type AB and a 50% chance of being type A (heterozygous genotype AO). Finally, if your blood type is AO and your husband's is BB, your child has a 50% chance of being AB and a 50% chance of being type B (heterozygous BO).
Does that make sense?
Blood Typing by: Anonymous
Baby may be AB+ or O+.
Answer may be O group by: VENU
As per my experience your baby blood group may be 0 group.