madmouse
the antibiotics are normally given as a first dose through a drip over about 15 mins, then subsequent 4 hourly doses given as a squirt into the cannula. It does not have to restrict movement etc.
If there is not 4 hours of cover, baby can have a small IM injection of penicillin which provides adequate cover.
However, being tested is a double edged sword, as some women using birth centres and homebirthers etc seem to have problems in getting the antibiotics and I have read on mn recently of women being refused the use of the birth centre if GBS+ or the m/w using it as an excuse to prevent homebirths.
In the hospital in London that I work in, the BC will give antibiotics, so its not a problem, but it will probably keep you in hospital for 24-48 hours for monitoring of baby.
Personally, and although I swab many women in delivery suite when I do speculum exams, I would not have testing done for the above reasons, also that the vast majority of women who are GBS+ are never picked up and go on to have healthy babies.
I know that there is a small risk, but it is tiny compared to other (admittedly tiny)risks in pregnancy (eg amnio / cvs, scar rupture, very post dates etc,) and people are willing to take these risks.
I think, as in many things in pregnancy, it all depends on the level of risk you are willing to take.