On and off brown spotting since 10 dpo

I've been experiencing on and off brown spotting since 10 dpo, a bit of cramping and no period yet. I never spot unless it's the day before my period and this spotting started 4 days before period . My temps are still high but I tested today at 13 dpo with frer and its negative 😭. Any ideas ? Has anyone experienced brown spotting and eventually got a bfp?