I had the swab done at 30 weeks. I was told that if I didn't know my results or didn't have the test done, I would be treated as if I was positive. My sister in law had the test done, she never found out her results. A few days after her son was born, he had some troubles, ended up having convulsions because his body was silently starving himself, he had no energy to cry. He was taken to hospital where tests where done, turns out he had strep b. His development has been a bit slower than normal, but he is still developing. They may not know the full effect of it until he is a bit older. Fingers crossed he will be ok.