So my last period was June 11-17th and this month I've had unprotected sex the 3th-5th. Now my period is due today but I've "already had it." Could it be implantation bleeding?(I heard it could be anywhere from 3-12 days) today seems to have been my last day. Super light[normally really heavy], lots of discharge, lighter cramping than normal, and it's only lasted 3 days when the normal is 5-7. Should I take a test or am I just being paranoid?