I Am Having What Seems To Be Implantation Bleeding For

I am having what seems to be implantation bleeding for 3 days.... I had my last period on 2nd Aug and started bleeding on 26 Aug again. Dark brown to pink in colour, a little red sometimes, very light spotting first day, then light bleeding inconsistently... Im ttc and been closely tracking my cycle to concieve. Please suggest what to do. Preg test negative