I was positive with DD and am waiting for my next swab with #2, they say you can be positive with 1 and never again or not with the first and positive with the 2nd etc.

I was really worried about the GBS with DD as we didn't make it to hospital, i remember telling the guy at 000 i shouldn't be at home i should be in hospital getting AB's, he said it's too late to worry about that now.
DD was breach and i was so worried that as her head was in there longer than normal that she would get sick.
She didn't and was perfectly fine, even after taking a few gulps in there i'm sure, they kept an eye on her and checked her regularly to make sure there were no signs of infection.
I believe they also did some bloods to make sure nothing else was wrong before we left!

When you call your hosp just let them know about the GBS and they can instruct you from there, try not to worry about it unless you really need to!