has this happened to anyone??TMI

I'm kinda getting worried now.. So i was 10-11 dpo and started spotting light pink. thought I was about to start my menstrual cycle then I had no spotting at all on day 12-13 dpo.. then on day 14-15 dpo I had some more spotting pink/Brown discharge and only when I wipe (Sorry for tmi) nothing on pad at all... I am currently 17 dpo and still no sign on period and no spotting. with all negative tests... has this ever happened to anyone?? I am not taking an birth control.. have been ttc for 1 year in a half now.