The swab is to check for infection. It is a reference at a "point in time".
If you are positive for GBS, then you're put on antibiotics. If you're negative, it doesn't mean you'll be negative later.
If your waters break and labour isn't quick, they'll check for GBS again and put you on more antibiotics. So basically, if you test positive, then treated, it's not assumed you're negative later. If anything happens that may impact bub, they'll test anyhows and it will be more accurate as to the impact for bubs. (FWIW, my midwife at the FBC mentioned all this and she doesn't seem to think it achieves anything done too early)
good luck.


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