Hi, I am very concerning that the guy before me who drew some blood by the nurse in the pricking way might leave some blood on the cotton bag. After the pricking, he dropped his first cotton real fast, soon her realized that his finger was still bleeding, thus, he took another piece of cotton out the cotton bag on the 'blood drawing site', i feel dreadful about it because he might leave some blood on the rest of the cottons in the cotton plastic bag and contaminated it.. what should i do? Am i at risk?