Curious!!!!

i had sex Friday, September 23rd with my bf a couple days before my period was suppose to come on. my period ended up getting knocked back 2 days late. it lasted the full week but now 2-3 days after my period was suppose to go off i'm still spotting..... this has never happened to me before. usually my period comes on & then goes off when it's suppose to. Friday will be 2 weeks since i had sex. should i take a pregnant test or just wait it out to see if the spotting stops? it's not a lot of blood, but everytime i wipe its blood & then there's a little spotting in my panty liner. HELP PLEASE!!