Hi I am 20 years old and my period flows r normal 28 day cycle and come on exact day im expecting them ... Two weeks before my last period I had unprotected sex with my boyfriend at the time and tested and it was negative ... Came on my period all fine and dandy ... But this month I am 3 days late havent had sex for 6 or so weeks and I am really confused cos im not stressed I eat properly and I am functioning properly ... Should I be worried?? What could be going on?? Please help