Blood Drop on glass of water - Worried

[andquestion3]

Hi Doctor, I had been to a dentist recently. She had to re-fit the dental cap. While she did that, she asked me to take some water spit out. There was this plastic cup. On the edge of the cup which was a little flat edge - there was something red - I assume it was big blood drop. While I took the water - I think it may have also dripped from the edge of the cup into the mouth.
I understand that if there is no cut in the mouth there is no risk - but since it was a dental procedure there may be a slight bleeding in the gums.
Am I at Risk ? am worried please help answer. I dont know how long the deop was exposed to air.

[CurfewX]

Even with a cut in your mouth or bleeding gums, you had no risk for HIV.  HIV is not able to infect once it is outside the body, so blood on surfaces or in water is not a risk for HIV.

Risks are:
1) having unprotected, penetrative vaginal or anal sex, or
2) sharing IV drug needles with other IV drug users.

That's it.  Nothing else you can think of is a risk.