Implantation Bleeding and HPT...?

For all you ladies who experienced implantation bleeding...how long afterwards did you get your BFP? Just last night, I had a small amount of very light pink and dark brown stuff when wiping and nothing else the rest of the night. This morning, some more. This is completely unlike a normal period for me, which starts heavy and bright red. I tested this morning, but BFN...and was expecting it, but couldn't help myself :) Any insight or experiences would be GREATLY appreciated!