Before seven months I had sexual acitivity with a prositute but I used condom at that time.Before one week I was very worried about that,so I accept an Bloodcheck in the officially CDC of Dresden.Doctor said I was all right and show me the result of "Negative“ 。But I was more feared about the posibility of "Wrong Negative” even the posibility was very little.Although the doctor promised that they didn't do anything wrong and the result was definitely reliable.But I still want to know ,whether the posibility of "Wrong Negative" exists.Will "Wrong Negative" happens to me? I was very anxious during these days and don't know how to continue my life.Please ,could some one help me?