L.M.
I worked Labor and Delivery. Group B is VERY common. It is a bacteria in the vagina that can pass to the baby during delivery. Mom gets several rounds of antibiotic during labor to help protect the baby. It is a natural bacteria (it has nothing to do with cleanliness or SIDs) It is safe to have a vaginal delivery with group b strep. Since you are a scheduled cection you won't have to worry about the transfer at all. Some hospitals administer the antibiotic with a cection and some don't, either way you and your baby will be happy and healthy.
Don't worry!!!