How many days after IB did you get BFP?

I had implantation bleeding around 9-10dpo and it was only a few pink drops when I wiped and havnt had much since.  Last night DH and I did the deed and I had some brown/pink spotting after but by morning and today it's gone.  I took a test today at 12dpo and got a BFN...I thought for sure this was the month...should I still have hope? AF is due Friday....