I had protected sex with a lady with three children and an alcoholic husband. I am 40 yrs male and the lady is 46 yrs old. its exactly 4 months now and had elisa antibodies test. thank god its non reactive. Now my question is i did not know the generation of ELISA test done. If its was a first generation test do i need to test again at 6 months mark. Lastly, can you tell me what are the window period for 1st, 2nd and 3rd generation antibodies test. Thank you.