Had sex last day of ovulation. Period late negative test

Hey ladies(: i posted already but i thought id explain more in detail. I have been keeping track of my cycle on here and me n hubby had sex on my last day of ovulation which was about 2 weeks ago. Now my period is about 5 days late n i feel tired n hungry a lot. Mild pelvic pain n big difference in my bowels. I took a test 2 days ago and it was negative... Any thoughts? They are very much appreciated