Hmm, interesting question! I'm not sure, though it doesn't really matter if you do smell like garlic, does it? Just tell him you had italian food the night before 
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However, if you want to be sure you've killed off the GBS, without any lingering odor, I'd recommend trying a Hibiclens wash. Worked for me with #2, and it's been shown to be as effective as abx at eliminating GBS (it doesn't just fool the test--it actually kills the bugs, though GBS is one of those things that can come and go, even after abx).
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Here's the Hibiclens protocol (you can buy it in any drugstore--blue bottle):
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www.birthcottage.com/images/GBS%20Protocol.PDF