Help!

Today marks a week since my period ended on the 20th now I'm experiencing light bleeding what could it be? Me and my fiance had sex on the last 2 days of my period 19th,20th then the last 3 days i was visiting 21st,22nd,23rd now I woke up to go to the bathroom I wiped and seen light blood kinda freaked me out because I know it's too early for implantation and don't want to get my hopes up this month.