Hello there
First signs of vaginal infection (otherwise known as vaginitis) are vaginal discharge, itching and burning.
Since you are afraid and you are assuming that you suffer from bacterial vaginosis you should be aware that abnormal vaginal discharge is one of the first symptoms. This discharge usually have very strong odor. The color of the discharge is usually white or gray and sometimes it smells very unpleasant after intercourse.
As well you can experience burning during urination and sometimes even itching around vagina. If you experience all of this than you should consult your gynecologist again. She will make diagnosis and let you know about treatment options. And the sooner you start with treatment the better. Good luck and I hope that everything will turn out just fine.