Thanks Auntiejessie. I took 4th gen rapid combo test on the 41 day after the last protected exposure. The result was negative. Recently I experience jock itch at my inner thigh followed by painful ulcer on my tongue besides the above Strep B diagnosis for my partner. I'm now worried that the result is false negative and these are the symptoms of hiv or any other stds.
No, it is not transmitted sexually. It is extremely common and rarely causes problems. Here's some info about Strep B: https://www.mayoclinic.org/diseases-conditions/group-b-strep/symptoms-causes/syc-20351729
If the doctor believe it requires treatment, a simple round of common antibiotics will be prescribed. You did not and could not have given this to her.