Dear doctor,i had a recent encounter. I had read the lesson about it,but I am not assume. Very worried.

I had a hangnail on the back of my finger,the width of it is about 2 mm , and I pulled it off,and then it bleed slightly at once. Fifty minutes later , I used the finger fingering the woman's vaginal.

Assuming the woman was hiv .....Chances of contraction?