Could I Get HIV If A Cotton Ball Possibly Stained With Another Person S Blood Was Used To Wipe My Pricked Finger During Testing?

I had hiv testing in a hiv facility, and before i got tested someone went ahead before me. As soon as i sat on the chair to get tested i noticed a cotton ball, i saw a stain on it and i suspect it as a blood stain. After i got pricked on my finger, the medical technician used that cotton ball to wipe my pricked finger and i told him there s a stain... If that cotton ball has really a blood stain used by other the person who went ahead of me, will i get infected by hiv (if he is hiv positive)??? Please educate me more if there s a risk. Thank you!