Inner Lip Bite and HIV Saliva

I recently moved to the city and the other day while riding the bus a woman—who, with no desire to be judgmental or distort the truth, appeared to be a drug user—greeted oncoming passengers, occasionally spitting while she spoke. Now, I inadvertently bit an inner part of my lip hours earlier—approximate 4—and feel some of her saliva may have gone in my mouth as she greeted me. Although a minuscule amount, could I possibly contract HIV, assuming she has it, from the cut on my lip that my tooth made and what are the chances?

[Teak]

You never had an exposure saliva is not infectious.