implantation bleeding

i am 12 dpo. I started light spotting at 9 dpo. it has continued to be a light pinkish / brown color. I am not due to start my period until august 3rd. I took a test this morning and it said negative. things i have read online says that it could take 4 - 5 days after implantation bleeding for a positive test. i have sore / tender breasts, headaches, backaches, very very mild cramping that comes and goes, and nausea. the spotting has continued to be very little, only when i wipe or a small spot on a panty liner over night. does this look like implantation bleeding ?? when did everyone get there positive after implantation ??