hi worrymummy,
I was found to be GBS+ve during my second labour. too late for IV ABs so they just monitored the baby for 24 hours. AOK.
I planned a homebirth for my 3rd, partly due to ridiculous hospital policies on GBS: no waterbirth, etc. I've been through the NHS hoops.
I had an independent midwife who sees this a lot, so I valued her advice.
My only options were oral ABs or risking it. The hospital wouldn't administer IV ABs in the home in case I had an allergic reaction.
You need to get the timing right on oral ABs - the course is 5 days, I needed to have had roughly 2 days worth before birth or the hospital was insisting the baby stayed in for a course of IV ABs.
You COULD go to hospital for one dose of IV ABs and then discharge yourself, but that is a pain mid-labour, and the ABs are supposed to be administered every 4 hours throughout labour. This was my Plan A, though.
If this is your 2nd or more baby, it's easier to assess the risk. If you were GBS +ve with an earlier child who did not have a problem, then subsequent babies are likely to be ok too. (those were the RCOG guidelines when I checked.)
Bottom line, you are in charge. The hospital may have very strict policies, but you can say no. I found there was a very low level of knowledge about GBS and weren't following the GBSS recommendations Or the RCOG guidelines. Chances are, if you read their websites, you'll be as well / better informed.