Hi,
Ladynoor I was in the same position 20 months ago and I made the decision no to have the test. I'm allergic to Penicillin and didn't want the alternative AB's at home.
The test isn't overly reliable either.

My membranes ended up rupturing about 30 hrs before I went into labour and i didn't feel stressed at all. I was still quite happy to wait 3-4days( if everything was fine) and check my Temp. Technically if i was in hospital I would have had AB's at 18-24hrs but such is the beauty of birthing at home.
Anyway to cut a long story short , everything was fine with daughter.

Some hospital don't even swab for GBS and work on risk factors such as prematuriy and prolonged ROM with no difference to outcomes when compared to prophylactic AB"s from a positive swab.
Good Luck with your decision