13 dpo bfn question

Hello! Needing some opinions....

I had implantation bleeding sunday 23rd & monday 24th. Im 13 dpo today and got a BFN. Wouldnt a BFP show up by now, knowing i had implantation spotting? AF due in the next couple of days. Feel like im out this month, since i know theres been a week since implantion bleeding and ive had all bfns. Thanks in advance