Hi I Finished My Birth Control Pack In February And

Hi I finished my birth control pack in February and had my regular periods since with my cycles ranging from 28-32 days, we are ttc, since I stopped the pill I did get the brown discharge mid cycle, this month I did get the brown discharge and my period was due 5 days ago, I do have a brown discharge at times when I wipe. Pregnancy test are all negative. What could this be health wise?