About 7 weeks ago I had sex with lady I met of an unknown status. The condom I used pulled out but I immediately wore another one as soon as I noticed. 3 weeks after the incident I had an unprotected virginal sex with my Ex. I ran an antibody test at about 7 weeks (and 3 after the second exposure) and the patient line on the determine was faintly visible indicative of a positive result. Thereafter I ran another determine, uni gold and stat pack and they all come negative. I have since been freaking out with regards to the initial positive result. How accurate is my result with regards to the outcome of my results?