Baby is also Rh-
Your baby will also be rh-.
Because rh- is recessive to rh+ you and your boyfriend both have two rh- genes. Your haplotype is rh-/rh- and your phenotype rh- and so is his. You and he can only give rh- genes to your babies. All of your babies with this father will be rh-/rh-. Don't sweat it.