I had an exposure on march 28th condom slipped and did not notice.. i got tested 81 and 111 days afterwards with a 4th gen and both came out negative.. yet i have a bump on my neck for about 2 months now which im sure is a swollen lymph node it does not hurt at all but i am verry worried that it can be a symptom of hiv.. are these test conclusive at the time i completed them ? I get so confused about the window period