I am slightly concerned. I have had paragard in for 9 years and I have always had heavy brown spotting right before my monthly starts. It usually lasts for 3 days and increases in amount until my period makes its full blown appearance. According to this ap (which hasn't always been super accurate) I was due 6 days ago. It should have ended today. Instead, I had the brown heavy spotting for days now but no period yet. I had minor cramping, headaches, and my boobs have swelled... All my typical PMS symptoms. I even had sex on day 3 of heavy spotting and I expected it to bring my period in which has happened in the past and nothing. 

Could I just be having an extremely off and light month or is this something more