I'm 16 days late period, sore breast, lower backache, cramps and have the flu. I never been this late before, trying to conceive for three years. Unprotected sex. But negative test 4 days ago. I did got pg once but ended in a mc last year. I was wondering if it's possible I'm pregnant?

You must know by now that of course it's possible, and of course there's not much point in saying it's possible. Flu, menstrual symptoms, pregnancy symptoms, delayed period, skipped period - you name it. You either are pregnant or you aren't, and you won't know until a test is positive.