You never rely on another persons test results. You rely on your test results.
yesterday she told me that her last sexual intercourse was on the month of 7/8...can i rely on her test which was on 17/12/10?
Wrong...Neither PCR tests will give a conclusive result.
if you are worried , take a pcr test. this test provides a 100% accuracy at one month but it's expensive.. if you can go and make it and the results will be available at a week or 2
a) only if she has hiv
b) exactly...you dont know FOR SURE that she has not had unprotected sex in the last 3 months
c) 6 weeks is a good indication...3 months is conclusive