I was actually thinking about this test and what happens if you have your baby before 36 weeks, how would they know if your testing positive to it?
They wouldn't know. It would just be a case of them keeping an eye on bubs temp and if it went up I guess GBS infection would be one of the first things they think of. As far as I'm aware, it's pretty rare as only quite a small %age of bubs born to GBS mums actually aquire the infection themselves during the birth process.