Negative Test after implantation

Background story— I’ve been ttc since 2021 (did first round of clomid then) but was unsuccessful. Did my second round of clomid + uterine massages this February and this has been my BBT charts. I’ve had what I believe is implantation bleeding yesterday and this morning (brown CM and just been spotting). My expected cycle should be between the 31st and the 3rd. I’ve taken test 3 days in a row, including today, and tests are negative. Has this been similar to any else’s story?