Please help 🥺🤦🏻‍♀️

I’m supposed to start my period any day now, had unprotected sex a couple weeks ago, not sure if he finished or not tbh, but I went to use the bathroom tonight and saw like a VERY light pink streak in my undies that wasn’t there before 🤦🏻‍♀️ & wiped and also seen some on that too. It wasn’t much of it. I don’t normally ‘spot’ before my period, it normally just flows so I don’t know if it’s beginning of my period or its possibly implantation bleeding?