Hm. Interesting question. So, did you take antibiotics for the GBS? How long ago? Was it cleared before you gave birth? You may no longer have it if so. I am guessing your child will be just fine.
Your baby will be fine, it's only really a concern during the birthing process. It's a normal bacteria that is in your body at all times, and sometimes it gets a "colonized" or there is more than the normal amount. It's harmless, except to an infant, but only during childbirth is there a risk of infection for them. You can also be positive at one point and negative later- the antibiotics don't really "cure" it but they do go back into balance on their own. I had it with my first, and then not again until 16 years later with my most recent baby.
Not sure about afterwards, but I was GBS positive with both my pregnancies and was given antibiotics before I actually delivered. Did not have any issues with it.