Implantation ?


So at 8DPO I was cramping a lot, when I went to the bathroom at night there was a little bit of blood in the toilet and on the toilet paper it was very light pink. After that I didn’t bleed again. The next day at 9dpo I tested with first response 6days sooner and it was negative and again at night I swear I saw a shadow line. I tested today at 10dpo and it was also negative.

How far along should I wait to test if it was implantation bleeding? Also only symptoms I have is diarrhea and sore breasts also tingly tinge cramping on my left side.