Implantation bleeding ? Am I pregnant ? Plssss help

Izabella • Not TTC, married June 7th 2015 :)❤

I had unprotected sex with my husband on 10th but I took a plan B afterward, now it's 22nd and am bleeding lightly, not like a period which started last night, is this implantation bleeding ? Or did my period just starting early ?

Pls help , thanks in advance