Don't worry LBB.
The statistic is one in four of the babies WHO DEVELOP STREP B died. But your baby is not going to develop strep B, because the medics know you are a carrier and you will get the ABs. In fact, your baby is probably the safest on the fab feb thread as far as the chances of getting strep B are concerned, because you are the mama who knows she's going to have the ABs.
The risks are tiny tiny tiny tiny (or even zero) till the waters have gone. Your baby is currently in a sterile sac, where they have eben safely growing for 8 months so far, and nothing has got in past the mucous plug and the sac, and nothing is going to. If your waters go, then the ABs need to start pronto, and that's fine, you'd be hauling your fat arse (I'm not saying your fat, dear, just pregnant like the rest of us) to the hospital as soon as the waters go sloosh. No problem. Mostly, people's waters DON'T go first unless the baby is posterior. Mostly, the waters go really close to when the baby is coming out. So the risks are even lower of the baby picking up the strep B, not only becuase you'll be there being monitored, but also because it's not as if you'll be sitting around for 24 hours with ruptured membranes waiting for the baby to come out, you'll either be on the ABs already, or the waters will go and you'll ahve been on the ABs for a few hours already because you're well into labour.
you're really in very safe hands.
I would say "go and have a chat with your midwife about this" but I think you might throw something at me...