Implantation bleeding?


I am currently 10dpo at 6dpo i had pink spotting when i wiped once an then a tiny bit of pink with little dishcharge ln underwear an hour later an then when i wiped i had brown discharge no cramping an havnt had anymore spotting since. I have never ever had that before. Im wondering if it was implantation bleeding?? Af is due Thursday, i tested today an was negative. If it was implantation bleeding how long till you can normally get a positive? Ttc 2nd baby, had a chemical last month. Sorry for the long post!