You do have to have injections every pregnancy (as long as your partner is +) but it is only something that needs to be done at high risk times (such as after a bleed or amnio) or in the third trimester. If your daughter is negative (and it sounds like she is) then you wouldn't have developed antibodies last pregnancy and therefore pose no risk to this one, it is only if this bub is positive then you could develop antibodies that would pose a risk to future pregnancies as far as I'm aware?