Help I don't know what to believe.I had a low risk encounter with a friend I know well but not with him every night.Decided to get an dna by pcr hiv test from online testing site Testalert.com.I got the pcr dna test 21 days after encounter.Test results :HIV not detected.I don't know what to think after reading some posts here.Was 21 days too long to wait for dna by pcr hiv test.Can I trust the not detected results.Really thought I was over this.What should I do?Thank you