when i tested at first palce,the nurse reused the syringe,no boold inside,it seems to be dry.she took the needle from a box,linked to syringe,no boold on it,the inner part of the needle i could't see,how can i be sure it was a new one?it was MCH of hospital,the people who test boold were fewer,i could only guarantee tow minutes there was no one test before me,the nurse used alcohol to clean my skin before test,should i be worry about this?